diff --git a/cluster-autoscaler/FAQ.md b/cluster-autoscaler/FAQ.md
index 6eef6433d797..68d0f176a0df 100644
--- a/cluster-autoscaler/FAQ.md
+++ b/cluster-autoscaler/FAQ.md
@@ -882,6 +882,7 @@ The following startup parameters are supported for cluster autoscaler:
 | `balance-similar-node-groups` | Detect similar node groups and balance the number of nodes between them | false
 | `balancing-ignore-label` | Define a node label that should be ignored when considering node group similarity. One label per flag occurrence. | ""
 | `balancing-label` | Define a node label to use when comparing node group similarity. If set, all other comparison logic is disabled, and only labels are considered when comparing groups. One label per flag occurrence. | ""
+| `skip-similar-node-group-recomputation` | Should CA skip similar NodeGroup recomputation for the best option returned by the expander during scaleups. You must enable `balance-similar-node-groups` for this to work. | false
 | `node-autoprovisioning-enabled` | Should CA autoprovision node groups when needed | false
 | `max-autoprovisioned-node-group-count` | The maximum number of autoprovisioned groups in the cluster | 15
 | `unremovable-node-recheck-timeout` | The timeout before we check again a node that couldn't be removed before | 5 minutes
diff --git a/cluster-autoscaler/config/autoscaling_options.go b/cluster-autoscaler/config/autoscaling_options.go
index e9bafdbd8903..2554f8b1d29f 100644
--- a/cluster-autoscaler/config/autoscaling_options.go
+++ b/cluster-autoscaler/config/autoscaling_options.go
@@ -120,6 +120,8 @@ type AutoscalingOptions struct {
 	GpuTotal []GpuLimits
 	// NodeGroupAutoDiscovery represents one or more definition(s) of node group auto-discovery
 	NodeGroupAutoDiscovery []string
+	// SkipSimilarNodeGroupRecomputation skips similar NodeGroup recomputation for the best option returned by the expander during scaleups
+	SkipSimilarNodeGroupRecomputation bool
 	// EstimatorName is the estimator used to estimate the number of needed nodes in scale up.
 	EstimatorName string
 	// ExpanderNames sets the chain of node group expanders to be used in scale up
diff --git a/cluster-autoscaler/core/scaleup/orchestrator/orchestrator.go b/cluster-autoscaler/core/scaleup/orchestrator/orchestrator.go
index 6c6b229bcc10..f85138d5a34d 100644
--- a/cluster-autoscaler/core/scaleup/orchestrator/orchestrator.go
+++ b/cluster-autoscaler/core/scaleup/orchestrator/orchestrator.go
@@ -229,7 +229,7 @@ func (o *ScaleUpOrchestrator) ScaleUp(
 		}
 	}
 
-	scaleUpInfos, aErr := o.balanceScaleUps(now, bestOption.NodeGroup, newNodes, nodeInfos, schedulablePodGroups)
+	scaleUpInfos, aErr := o.balanceScaleUps(now, bestOption, newNodes, nodeInfos, schedulablePodGroups)
 	if aErr != nil {
 		return status.UpdateScaleUpError(
 			&status.ScaleUpStatus{CreateNodeGroupResults: createNodeGroupResults, PodsTriggeredScaleUp: bestOption.Pods},
@@ -680,13 +680,16 @@ func (o *ScaleUpOrchestrator) GetCappedNewNodeCount(newNodeCount, currentNodeCou
 
 func (o *ScaleUpOrchestrator) balanceScaleUps(
 	now time.Time,
-	nodeGroup cloudprovider.NodeGroup,
+	bestOption *expander.Option,
 	newNodes int,
 	nodeInfos map[string]*schedulerframework.NodeInfo,
 	schedulablePodGroups map[string][]estimator.PodEquivalenceGroup,
 ) ([]nodegroupset.ScaleUpInfo, errors.AutoscalerError) {
-	// Recompute similar node groups in case they need to be updated
-	similarNodeGroups := o.ComputeSimilarNodeGroups(nodeGroup, nodeInfos, schedulablePodGroups, now)
+	similarNodeGroups := bestOption.SimilarNodeGroups
+	if !o.autoscalingContext.SkipSimilarNodeGroupRecomputation {
+		// Recompute similar node groups in case they need to be updated
+		similarNodeGroups = o.ComputeSimilarNodeGroups(bestOption.NodeGroup, nodeInfos, schedulablePodGroups, now)
+	}
 	if similarNodeGroups != nil {
 		// if similar node groups are found, log about them
 		similarNodeGroupIds := make([]string, 0)
@@ -699,7 +702,7 @@ func (o *ScaleUpOrchestrator) balanceScaleUps(
 		klog.V(2).Info("No similar node groups found")
 	}
 
-	targetNodeGroups := []cloudprovider.NodeGroup{nodeGroup}
+	targetNodeGroups := []cloudprovider.NodeGroup{bestOption.NodeGroup}
 	for _, ng := range similarNodeGroups {
 		targetNodeGroups = append(targetNodeGroups, ng)
 	}
diff --git a/cluster-autoscaler/expander/grpcplugin/grpc_client.go b/cluster-autoscaler/expander/grpcplugin/grpc_client.go
index 7bcab0c8158d..fc559667df0c 100644
--- a/cluster-autoscaler/expander/grpcplugin/grpc_client.go
+++ b/cluster-autoscaler/expander/grpcplugin/grpc_client.go
@@ -22,6 +22,7 @@ import (
 	"time"
 
 	v1 "k8s.io/api/core/v1"
+	"k8s.io/autoscaler/cluster-autoscaler/cloudprovider"
 	"k8s.io/autoscaler/cluster-autoscaler/expander"
 	"k8s.io/autoscaler/cluster-autoscaler/expander/grpcplugin/protos"
 	"k8s.io/klog/v2"
@@ -111,11 +112,20 @@ func populateOptionsForGRPC(expansionOptions []expander.Option) ([]*protos.Optio
 	nodeGroupIDOptionMap := make(map[string]expander.Option)
 	for _, option := range expansionOptions {
 		nodeGroupIDOptionMap[option.NodeGroup.Id()] = option
-		grpcOptionsSlice = append(grpcOptionsSlice, newOptionMessage(option.NodeGroup.Id(), int32(option.NodeCount), option.Debug, option.Pods))
+		similarNodeGroupIds := getSimilarNodeGroupIds(option)
+		grpcOptionsSlice = append(grpcOptionsSlice, newOptionMessage(option.NodeGroup.Id(), int32(option.NodeCount), option.Debug, option.Pods, similarNodeGroupIds))
 	}
 	return grpcOptionsSlice, nodeGroupIDOptionMap
 }
 
+func getSimilarNodeGroupIds(option expander.Option) []string {
+	var similarNodeGroupIds []string
+	for _, sng := range option.SimilarNodeGroups {
+		similarNodeGroupIds = append(similarNodeGroupIds, sng.Id())
+	}
+	return similarNodeGroupIds
+}
+
 // populateNodeInfoForGRPC looks at the corresponding v1.Node object per NodeInfo object, and populates the grpcNodeInfoMap with these to pass over grpc
 func populateNodeInfoForGRPC(nodeInfos map[string]*schedulerframework.NodeInfo) map[string]*v1.Node {
 	grpcNodeInfoMap := make(map[string]*v1.Node)
@@ -132,8 +142,9 @@ func transformAndSanitizeOptionsFromGRPC(bestOptionsResponseOptions []*protos.Op
 			klog.Error("GRPC server returned nil Option")
 			continue
 		}
-		if _, ok := nodeGroupIDOptionMap[option.NodeGroupId]; ok {
-			options = append(options, nodeGroupIDOptionMap[option.NodeGroupId])
+		if expanderOption, ok := nodeGroupIDOptionMap[option.NodeGroupId]; ok {
+			expanderOption.SimilarNodeGroups = getRetainedSimilarNodegroups(option, expanderOption)
+			options = append(options, expanderOption)
 		} else {
 			klog.Errorf("GRPC server returned invalid nodeGroup ID: %s", option.NodeGroupId)
 			continue
@@ -142,6 +153,25 @@ func transformAndSanitizeOptionsFromGRPC(bestOptionsResponseOptions []*protos.Op
 	return options
 }
 
-func newOptionMessage(nodeGroupId string, nodeCount int32, debug string, pods []*v1.Pod) *protos.Option {
-	return &protos.Option{NodeGroupId: nodeGroupId, NodeCount: nodeCount, Debug: debug, Pod: pods}
+// Any similar options that were not included in the original grpcExpander request, but were added
+// as part of the response, will be ignored
+func getRetainedSimilarNodegroups(grpcOption *protos.Option, expanderOption expander.Option) []cloudprovider.NodeGroup {
+	var retainedSimilarNodeGroups []cloudprovider.NodeGroup
+	for _, sng := range expanderOption.SimilarNodeGroups {
+		retained := false
+		for _, id := range grpcOption.SimilarNodeGroupIds {
+			if sng.Id() == id {
+				retained = true
+				continue
+			}
+		}
+		if retained {
+			retainedSimilarNodeGroups = append(retainedSimilarNodeGroups, sng)
+		}
+	}
+	return retainedSimilarNodeGroups
+}
+
+func newOptionMessage(nodeGroupId string, nodeCount int32, debug string, pods []*v1.Pod, similarNodeGroupIds []string) *protos.Option {
+	return &protos.Option{NodeGroupId: nodeGroupId, NodeCount: nodeCount, Debug: debug, Pod: pods, SimilarNodeGroupIds: similarNodeGroupIds}
 }
diff --git a/cluster-autoscaler/expander/grpcplugin/grpc_client_test.go b/cluster-autoscaler/expander/grpcplugin/grpc_client_test.go
index cb6882b79fc6..cc187e94b786 100644
--- a/cluster-autoscaler/expander/grpcplugin/grpc_client_test.go
+++ b/cluster-autoscaler/expander/grpcplugin/grpc_client_test.go
@@ -23,6 +23,7 @@ import (
 	"github.com/golang/mock/gomock"
 	"github.com/stretchr/testify/assert"
 	v1 "k8s.io/api/core/v1"
+	"k8s.io/autoscaler/cluster-autoscaler/cloudprovider"
 	"k8s.io/autoscaler/cluster-autoscaler/expander/grpcplugin/protos"
 	"k8s.io/autoscaler/cluster-autoscaler/expander/mocks"
 	. "k8s.io/autoscaler/cluster-autoscaler/utils/test"
@@ -58,6 +59,11 @@ var (
 		Debug:     "m4.4xlarge",
 		NodeGroup: test.NewTestNodeGroup("my-asg.m4.4xlarge", 10, 1, 1, true, false, "m4.4xlarge", nil, nil),
 	}
+	eoT2MicroWithSimilar = expander.Option{
+		Debug:             "t2.micro",
+		NodeGroup:         test.NewTestNodeGroup("my-asg.t2.micro", 10, 1, 1, true, false, "t2.micro", nil, nil),
+		SimilarNodeGroups: []cloudprovider.NodeGroup{test.NewTestNodeGroup("my-similar-asg.t2.micro", 10, 1, 1, true, false, "t2.micro", nil, nil)},
+	}
 	options = []expander.Option{eoT2Micro, eoT2Large, eoT3Large, eoM44XLarge}
 
 	grpcEoT2Micro = protos.Option{
@@ -84,6 +90,20 @@ var (
 		Debug:       eoM44XLarge.Debug,
 		Pod:         eoM44XLarge.Pods,
 	}
+	grpcEoT2MicroWithSimilar = protos.Option{
+		NodeGroupId:         eoT2Micro.NodeGroup.Id(),
+		NodeCount:           int32(eoT2Micro.NodeCount),
+		Debug:               eoT2Micro.Debug,
+		Pod:                 eoT2Micro.Pods,
+		SimilarNodeGroupIds: []string{eoT2MicroWithSimilar.SimilarNodeGroups[0].Id()},
+	}
+	grpcEoT2MicroWithSimilarWithExtraOptions = protos.Option{
+		NodeGroupId:         eoT2Micro.NodeGroup.Id(),
+		NodeCount:           int32(eoT2Micro.NodeCount),
+		Debug:               eoT2Micro.Debug,
+		Pod:                 eoT2Micro.Pods,
+		SimilarNodeGroupIds: []string{eoT2MicroWithSimilar.SimilarNodeGroups[0].Id(), "extra-ng-id"},
+	}
 )
 
 func TestPopulateOptionsForGrpc(t *testing.T) {
@@ -116,6 +136,12 @@ func TestPopulateOptionsForGrpc(t *testing.T) {
 				eoM44XLarge.NodeGroup.Id(): eoM44XLarge,
 			},
 		},
+		{
+			desc:         "similar nodegroups are included",
+			opts:         []expander.Option{eoT2MicroWithSimilar},
+			expectedOpts: []*protos.Option{&grpcEoT2MicroWithSimilar},
+			expectedMap:  map[string]expander.Option{eoT2MicroWithSimilar.NodeGroup.Id(): eoT2MicroWithSimilar},
+		},
 	}
 	for _, tc := range testCases {
 		grpcOptionsSlice, nodeGroupIDOptionMap := populateOptionsForGRPC(tc.opts)
@@ -146,18 +172,44 @@ func TestPopulateNodeInfoForGRPC(t *testing.T) {
 }
 
 func TestValidTransformAndSanitizeOptionsFromGRPC(t *testing.T) {
-	responseOptionsSlice := []*protos.Option{&grpcEoT2Micro, &grpcEoT3Large, &grpcEoM44XLarge}
-	nodeGroupIDOptionMap := map[string]expander.Option{
-		eoT2Micro.NodeGroup.Id():   eoT2Micro,
-		eoT2Large.NodeGroup.Id():   eoT2Large,
-		eoT3Large.NodeGroup.Id():   eoT3Large,
-		eoM44XLarge.NodeGroup.Id(): eoM44XLarge,
+	testCases := []struct {
+		desc                  string
+		responseOptions       []*protos.Option
+		expectedOptions       []expander.Option
+		nodegroupIDOptionaMap map[string]expander.Option
+	}{
+		{
+			desc:            "valid transform and sanitize options",
+			responseOptions: []*protos.Option{&grpcEoT2Micro, &grpcEoT3Large, &grpcEoM44XLarge},
+			nodegroupIDOptionaMap: map[string]expander.Option{
+				eoT2Micro.NodeGroup.Id():   eoT2Micro,
+				eoT2Large.NodeGroup.Id():   eoT2Large,
+				eoT3Large.NodeGroup.Id():   eoT3Large,
+				eoM44XLarge.NodeGroup.Id(): eoM44XLarge,
+			},
+			expectedOptions: []expander.Option{eoT2Micro, eoT3Large, eoM44XLarge},
+		},
+		{
+			desc:            "similar ngs are retained in proto options are retained",
+			responseOptions: []*protos.Option{&grpcEoT2MicroWithSimilar},
+			nodegroupIDOptionaMap: map[string]expander.Option{
+				eoT2MicroWithSimilar.NodeGroup.Id(): eoT2MicroWithSimilar,
+			},
+			expectedOptions: []expander.Option{eoT2MicroWithSimilar},
+		},
+		{
+			desc:            "extra similar ngs added to expander response are ignored",
+			responseOptions: []*protos.Option{&grpcEoT2MicroWithSimilarWithExtraOptions},
+			nodegroupIDOptionaMap: map[string]expander.Option{
+				eoT2MicroWithSimilar.NodeGroup.Id(): eoT2MicroWithSimilar,
+			},
+			expectedOptions: []expander.Option{eoT2MicroWithSimilar},
+		},
+	}
+	for _, tc := range testCases {
+		ret := transformAndSanitizeOptionsFromGRPC(tc.responseOptions, tc.nodegroupIDOptionaMap)
+		assert.Equal(t, tc.expectedOptions, ret)
 	}
-
-	expectedOptions := []expander.Option{eoT2Micro, eoT3Large, eoM44XLarge}
-
-	ret := transformAndSanitizeOptionsFromGRPC(responseOptionsSlice, nodeGroupIDOptionMap)
-	assert.Equal(t, expectedOptions, ret)
 }
 
 func TestAnInvalidTransformAndSanitizeOptionsFromGRPC(t *testing.T) {
diff --git a/cluster-autoscaler/expander/grpcplugin/protos/expander.pb.go b/cluster-autoscaler/expander/grpcplugin/protos/expander.pb.go
index 3c071d2f37d7..6c6a022acc75 100644
--- a/cluster-autoscaler/expander/grpcplugin/protos/expander.pb.go
+++ b/cluster-autoscaler/expander/grpcplugin/protos/expander.pb.go
@@ -17,13 +17,9 @@ limitations under the License.
 package protos
 
 import (
-	context "context"
 	reflect "reflect"
 	sync "sync"
 
-	grpc "google.golang.org/grpc"
-	codes "google.golang.org/grpc/codes"
-	status "google.golang.org/grpc/status"
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
 	v1 "k8s.io/api/core/v1"
@@ -49,7 +45,7 @@ type BestOptionsRequest struct {
 func (x *BestOptionsRequest) Reset() {
 	*x = BestOptionsRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_cluster_autoscaler_expander_grpcplugin_protos_expander_proto_msgTypes[0]
+		mi := &file_expander_proto_msgTypes[0]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -62,7 +58,7 @@ func (x *BestOptionsRequest) String() string {
 func (*BestOptionsRequest) ProtoMessage() {}
 
 func (x *BestOptionsRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_cluster_autoscaler_expander_grpcplugin_protos_expander_proto_msgTypes[0]
+	mi := &file_expander_proto_msgTypes[0]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -75,7 +71,7 @@ func (x *BestOptionsRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use BestOptionsRequest.ProtoReflect.Descriptor instead.
 func (*BestOptionsRequest) Descriptor() ([]byte, []int) {
-	return file_cluster_autoscaler_expander_grpcplugin_protos_expander_proto_rawDescGZIP(), []int{0}
+	return file_expander_proto_rawDescGZIP(), []int{0}
 }
 
 func (x *BestOptionsRequest) GetOptions() []*Option {
@@ -103,7 +99,7 @@ type BestOptionsResponse struct {
 func (x *BestOptionsResponse) Reset() {
 	*x = BestOptionsResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_cluster_autoscaler_expander_grpcplugin_protos_expander_proto_msgTypes[1]
+		mi := &file_expander_proto_msgTypes[1]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -116,7 +112,7 @@ func (x *BestOptionsResponse) String() string {
 func (*BestOptionsResponse) ProtoMessage() {}
 
 func (x *BestOptionsResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_cluster_autoscaler_expander_grpcplugin_protos_expander_proto_msgTypes[1]
+	mi := &file_expander_proto_msgTypes[1]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -129,7 +125,7 @@ func (x *BestOptionsResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use BestOptionsResponse.ProtoReflect.Descriptor instead.
 func (*BestOptionsResponse) Descriptor() ([]byte, []int) {
-	return file_cluster_autoscaler_expander_grpcplugin_protos_expander_proto_rawDescGZIP(), []int{1}
+	return file_expander_proto_rawDescGZIP(), []int{1}
 }
 
 func (x *BestOptionsResponse) GetOptions() []*Option {
@@ -145,16 +141,17 @@ type Option struct {
 	unknownFields protoimpl.UnknownFields
 
 	// only need the ID of node to uniquely identify the nodeGroup, used in the nodeInfo map.
-	NodeGroupId string    `protobuf:"bytes,1,opt,name=nodeGroupId,proto3" json:"nodeGroupId,omitempty"`
-	NodeCount   int32     `protobuf:"varint,2,opt,name=nodeCount,proto3" json:"nodeCount,omitempty"`
-	Debug       string    `protobuf:"bytes,3,opt,name=debug,proto3" json:"debug,omitempty"`
-	Pod         []*v1.Pod `protobuf:"bytes,4,rep,name=pod,proto3" json:"pod,omitempty"`
+	NodeGroupId         string    `protobuf:"bytes,1,opt,name=nodeGroupId,proto3" json:"nodeGroupId,omitempty"`
+	NodeCount           int32     `protobuf:"varint,2,opt,name=nodeCount,proto3" json:"nodeCount,omitempty"`
+	Debug               string    `protobuf:"bytes,3,opt,name=debug,proto3" json:"debug,omitempty"`
+	Pod                 []*v1.Pod `protobuf:"bytes,4,rep,name=pod,proto3" json:"pod,omitempty"`
+	SimilarNodeGroupIds []string  `protobuf:"bytes,5,rep,name=similarNodeGroupIds,proto3" json:"similarNodeGroupIds,omitempty"`
 }
 
 func (x *Option) Reset() {
 	*x = Option{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_cluster_autoscaler_expander_grpcplugin_protos_expander_proto_msgTypes[2]
+		mi := &file_expander_proto_msgTypes[2]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -167,7 +164,7 @@ func (x *Option) String() string {
 func (*Option) ProtoMessage() {}
 
 func (x *Option) ProtoReflect() protoreflect.Message {
-	mi := &file_cluster_autoscaler_expander_grpcplugin_protos_expander_proto_msgTypes[2]
+	mi := &file_expander_proto_msgTypes[2]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -180,7 +177,7 @@ func (x *Option) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Option.ProtoReflect.Descriptor instead.
 func (*Option) Descriptor() ([]byte, []int) {
-	return file_cluster_autoscaler_expander_grpcplugin_protos_expander_proto_rawDescGZIP(), []int{2}
+	return file_expander_proto_rawDescGZIP(), []int{2}
 }
 
 func (x *Option) GetNodeGroupId() string {
@@ -211,69 +208,76 @@ func (x *Option) GetPod() []*v1.Pod {
 	return nil
 }
 
-var File_cluster_autoscaler_expander_grpcplugin_protos_expander_proto protoreflect.FileDescriptor
-
-var file_cluster_autoscaler_expander_grpcplugin_protos_expander_proto_rawDesc = []byte{
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+func (x *Option) GetSimilarNodeGroupIds() []string {
+	if x != nil {
+		return x.SimilarNodeGroupIds
+	}
+	return nil
+}
+
+var File_expander_proto protoreflect.FileDescriptor
+
+var file_expander_proto_rawDesc = []byte{
+	0x0a, 0x0e, 0x65, 0x78, 0x70, 0x61, 0x6e, 0x64, 0x65, 0x72, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f,
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 }
 
 var (
-	file_cluster_autoscaler_expander_grpcplugin_protos_expander_proto_rawDescOnce sync.Once
-	file_cluster_autoscaler_expander_grpcplugin_protos_expander_proto_rawDescData = file_cluster_autoscaler_expander_grpcplugin_protos_expander_proto_rawDesc
+	file_expander_proto_rawDescOnce sync.Once
+	file_expander_proto_rawDescData = file_expander_proto_rawDesc
 )
 
-func file_cluster_autoscaler_expander_grpcplugin_protos_expander_proto_rawDescGZIP() []byte {
-	file_cluster_autoscaler_expander_grpcplugin_protos_expander_proto_rawDescOnce.Do(func() {
-		file_cluster_autoscaler_expander_grpcplugin_protos_expander_proto_rawDescData = protoimpl.X.CompressGZIP(file_cluster_autoscaler_expander_grpcplugin_protos_expander_proto_rawDescData)
+func file_expander_proto_rawDescGZIP() []byte {
+	file_expander_proto_rawDescOnce.Do(func() {
+		file_expander_proto_rawDescData = protoimpl.X.CompressGZIP(file_expander_proto_rawDescData)
 	})
-	return file_cluster_autoscaler_expander_grpcplugin_protos_expander_proto_rawDescData
+	return file_expander_proto_rawDescData
 }
 
-var file_cluster_autoscaler_expander_grpcplugin_protos_expander_proto_msgTypes = make([]protoimpl.MessageInfo, 4)
-var file_cluster_autoscaler_expander_grpcplugin_protos_expander_proto_goTypes = []interface{}{
+var file_expander_proto_msgTypes = make([]protoimpl.MessageInfo, 4)
+var file_expander_proto_goTypes = []interface{}{
 	(*BestOptionsRequest)(nil),  // 0: grpcplugin.BestOptionsRequest
 	(*BestOptionsResponse)(nil), // 1: grpcplugin.BestOptionsResponse
 	(*Option)(nil),              // 2: grpcplugin.Option
@@ -281,7 +285,7 @@ var file_cluster_autoscaler_expander_grpcplugin_protos_expander_proto_goTypes =
 	(*v1.Pod)(nil),              // 4: k8s.io.api.core.v1.Pod
 	(*v1.Node)(nil),             // 5: k8s.io.api.core.v1.Node
 }
-var file_cluster_autoscaler_expander_grpcplugin_protos_expander_proto_depIdxs = []int32{
+var file_expander_proto_depIdxs = []int32{
 	2, // 0: grpcplugin.BestOptionsRequest.options:type_name -> grpcplugin.Option
 	3, // 1: grpcplugin.BestOptionsRequest.nodeMap:type_name -> grpcplugin.BestOptionsRequest.NodeMapEntry
 	2, // 2: grpcplugin.BestOptionsResponse.options:type_name -> grpcplugin.Option
@@ -296,13 +300,13 @@ var file_cluster_autoscaler_expander_grpcplugin_protos_expander_proto_depIdxs =
 	0, // [0:5] is the sub-list for field type_name
 }
 
-func init() { file_cluster_autoscaler_expander_grpcplugin_protos_expander_proto_init() }
-func file_cluster_autoscaler_expander_grpcplugin_protos_expander_proto_init() {
-	if File_cluster_autoscaler_expander_grpcplugin_protos_expander_proto != nil {
+func init() { file_expander_proto_init() }
+func file_expander_proto_init() {
+	if File_expander_proto != nil {
 		return
 	}
 	if !protoimpl.UnsafeEnabled {
-		file_cluster_autoscaler_expander_grpcplugin_protos_expander_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+		file_expander_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*BestOptionsRequest); i {
 			case 0:
 				return &v.state
@@ -314,7 +318,7 @@ func file_cluster_autoscaler_expander_grpcplugin_protos_expander_proto_init() {
 				return nil
 			}
 		}
-		file_cluster_autoscaler_expander_grpcplugin_protos_expander_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
+		file_expander_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*BestOptionsResponse); i {
 			case 0:
 				return &v.state
@@ -326,7 +330,7 @@ func file_cluster_autoscaler_expander_grpcplugin_protos_expander_proto_init() {
 				return nil
 			}
 		}
-		file_cluster_autoscaler_expander_grpcplugin_protos_expander_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
+		file_expander_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*Option); i {
 			case 0:
 				return &v.state
@@ -343,98 +347,18 @@ func file_cluster_autoscaler_expander_grpcplugin_protos_expander_proto_init() {
 	out := protoimpl.TypeBuilder{
 		File: protoimpl.DescBuilder{
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
-			RawDescriptor: file_cluster_autoscaler_expander_grpcplugin_protos_expander_proto_rawDesc,
+			RawDescriptor: file_expander_proto_rawDesc,
 			NumEnums:      0,
 			NumMessages:   4,
 			NumExtensions: 0,
 			NumServices:   1,
 		},
-		GoTypes:           file_cluster_autoscaler_expander_grpcplugin_protos_expander_proto_goTypes,
-		DependencyIndexes: file_cluster_autoscaler_expander_grpcplugin_protos_expander_proto_depIdxs,
-		MessageInfos:      file_cluster_autoscaler_expander_grpcplugin_protos_expander_proto_msgTypes,
+		GoTypes:           file_expander_proto_goTypes,
+		DependencyIndexes: file_expander_proto_depIdxs,
+		MessageInfos:      file_expander_proto_msgTypes,
 	}.Build()
-	File_cluster_autoscaler_expander_grpcplugin_protos_expander_proto = out.File
-	file_cluster_autoscaler_expander_grpcplugin_protos_expander_proto_rawDesc = nil
-	file_cluster_autoscaler_expander_grpcplugin_protos_expander_proto_goTypes = nil
-	file_cluster_autoscaler_expander_grpcplugin_protos_expander_proto_depIdxs = nil
-}
-
-// Reference imports to suppress errors if they are not otherwise used.
-var _ context.Context
-var _ grpc.ClientConnInterface
-
-// This is a compile-time assertion to ensure that this generated file
-// is compatible with the grpc package it is being compiled against.
-const _ = grpc.SupportPackageIsVersion6
-
-// ExpanderClient is the client API for Expander service.
-//
-// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://godoc.org/google.golang.org/grpc#ClientConn.NewStream.
-type ExpanderClient interface {
-	BestOptions(ctx context.Context, in *BestOptionsRequest, opts ...grpc.CallOption) (*BestOptionsResponse, error)
-}
-
-type expanderClient struct {
-	cc grpc.ClientConnInterface
-}
-
-func NewExpanderClient(cc grpc.ClientConnInterface) ExpanderClient {
-	return &expanderClient{cc}
-}
-
-func (c *expanderClient) BestOptions(ctx context.Context, in *BestOptionsRequest, opts ...grpc.CallOption) (*BestOptionsResponse, error) {
-	out := new(BestOptionsResponse)
-	err := c.cc.Invoke(ctx, "/grpcplugin.Expander/BestOptions", in, out, opts...)
-	if err != nil {
-		return nil, err
-	}
-	return out, nil
-}
-
-// ExpanderServer is the server API for Expander service.
-type ExpanderServer interface {
-	BestOptions(context.Context, *BestOptionsRequest) (*BestOptionsResponse, error)
-}
-
-// UnimplementedExpanderServer can be embedded to have forward compatible implementations.
-type UnimplementedExpanderServer struct {
-}
-
-func (*UnimplementedExpanderServer) BestOptions(context.Context, *BestOptionsRequest) (*BestOptionsResponse, error) {
-	return nil, status.Errorf(codes.Unimplemented, "method BestOptions not implemented")
-}
-
-func RegisterExpanderServer(s *grpc.Server, srv ExpanderServer) {
-	s.RegisterService(&_Expander_serviceDesc, srv)
-}
-
-func _Expander_BestOptions_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
-	in := new(BestOptionsRequest)
-	if err := dec(in); err != nil {
-		return nil, err
-	}
-	if interceptor == nil {
-		return srv.(ExpanderServer).BestOptions(ctx, in)
-	}
-	info := &grpc.UnaryServerInfo{
-		Server:     srv,
-		FullMethod: "/grpcplugin.Expander/BestOptions",
-	}
-	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
-		return srv.(ExpanderServer).BestOptions(ctx, req.(*BestOptionsRequest))
-	}
-	return interceptor(ctx, in, info, handler)
-}
-
-var _Expander_serviceDesc = grpc.ServiceDesc{
-	ServiceName: "grpcplugin.Expander",
-	HandlerType: (*ExpanderServer)(nil),
-	Methods: []grpc.MethodDesc{
-		{
-			MethodName: "BestOptions",
-			Handler:    _Expander_BestOptions_Handler,
-		},
-	},
-	Streams:  []grpc.StreamDesc{},
-	Metadata: "cluster-autoscaler/expander/grpcplugin/protos/expander.proto",
+	File_expander_proto = out.File
+	file_expander_proto_rawDesc = nil
+	file_expander_proto_goTypes = nil
+	file_expander_proto_depIdxs = nil
 }
diff --git a/cluster-autoscaler/expander/grpcplugin/protos/expander.proto b/cluster-autoscaler/expander/grpcplugin/protos/expander.proto
index 5a08e8ff301b..8300ed49695e 100644
--- a/cluster-autoscaler/expander/grpcplugin/protos/expander.proto
+++ b/cluster-autoscaler/expander/grpcplugin/protos/expander.proto
@@ -27,4 +27,5 @@ message Option {
   int32 nodeCount = 2;
   string debug = 3;
   repeated k8s.io.api.core.v1.Pod pod = 4;
+  repeated string similarNodeGroupIds = 5;
 }
diff --git a/cluster-autoscaler/expander/grpcplugin/protos/expander_grpc.pb.go b/cluster-autoscaler/expander/grpcplugin/protos/expander_grpc.pb.go
new file mode 100644
index 000000000000..59b276756ea9
--- /dev/null
+++ b/cluster-autoscaler/expander/grpcplugin/protos/expander_grpc.pb.go
@@ -0,0 +1,114 @@
+/*
+Copyright 2021 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package protos
+
+import (
+	context "context"
+
+	grpc "google.golang.org/grpc"
+	codes "google.golang.org/grpc/codes"
+	status "google.golang.org/grpc/status"
+)
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the grpc package it is being compiled against.
+// Requires gRPC-Go v1.32.0 or later.
+const _ = grpc.SupportPackageIsVersion7
+
+// ExpanderClient is the client API for Expander service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
+type ExpanderClient interface {
+	BestOptions(ctx context.Context, in *BestOptionsRequest, opts ...grpc.CallOption) (*BestOptionsResponse, error)
+}
+
+type expanderClient struct {
+	cc grpc.ClientConnInterface
+}
+
+func NewExpanderClient(cc grpc.ClientConnInterface) ExpanderClient {
+	return &expanderClient{cc}
+}
+
+func (c *expanderClient) BestOptions(ctx context.Context, in *BestOptionsRequest, opts ...grpc.CallOption) (*BestOptionsResponse, error) {
+	out := new(BestOptionsResponse)
+	err := c.cc.Invoke(ctx, "/grpcplugin.Expander/BestOptions", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// ExpanderServer is the server API for Expander service.
+// All implementations should embed UnimplementedExpanderServer
+// for forward compatibility
+type ExpanderServer interface {
+	BestOptions(context.Context, *BestOptionsRequest) (*BestOptionsResponse, error)
+}
+
+// UnimplementedExpanderServer should be embedded to have forward compatible implementations.
+type UnimplementedExpanderServer struct {
+}
+
+func (UnimplementedExpanderServer) BestOptions(context.Context, *BestOptionsRequest) (*BestOptionsResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method BestOptions not implemented")
+}
+
+// UnsafeExpanderServer may be embedded to opt out of forward compatibility for this service.
+// Use of this interface is not recommended, as added methods to ExpanderServer will
+// result in compilation errors.
+type UnsafeExpanderServer interface {
+	mustEmbedUnimplementedExpanderServer()
+}
+
+func RegisterExpanderServer(s grpc.ServiceRegistrar, srv ExpanderServer) {
+	s.RegisterService(&Expander_ServiceDesc, srv)
+}
+
+func _Expander_BestOptions_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(BestOptionsRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(ExpanderServer).BestOptions(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/grpcplugin.Expander/BestOptions",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(ExpanderServer).BestOptions(ctx, req.(*BestOptionsRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+// Expander_ServiceDesc is the grpc.ServiceDesc for Expander service.
+// It's only intended for direct use with grpc.RegisterService,
+// and not to be introspected or modified (even as a copy)
+var Expander_ServiceDesc = grpc.ServiceDesc{
+	ServiceName: "grpcplugin.Expander",
+	HandlerType: (*ExpanderServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "BestOptions",
+			Handler:    _Expander_BestOptions_Handler,
+		},
+	},
+	Streams:  []grpc.StreamDesc{},
+	Metadata: "expander.proto",
+}
diff --git a/cluster-autoscaler/main.go b/cluster-autoscaler/main.go
index 71df2f221df9..f195cd48dcae 100644
--- a/cluster-autoscaler/main.go
+++ b/cluster-autoscaler/main.go
@@ -189,6 +189,8 @@ var (
 			"Azure matches by VMSS tags, similar to AWS. And you can optionally specify a default min and max size, e.g. `label:tag=tagKey,anotherTagKey=bar,min=0,max=600`. "+
 			"Can be used multiple times.")
 
+	skipSimilarNodeGroupRecomputation = flag.Bool("skip-similar-node-group-recomputation", false, "if true, skips similar NodeGroup recomputation for the best option returned by the expander during scaleups. You must enable `balance-similar-node-groups` for this to work.")
+
 	estimatorFlag = flag.String("estimator", estimator.BinpackingEstimatorName,
 		"Type of resource estimator to be used in scale up. Available values: ["+strings.Join(estimator.AvailableEstimators, ",")+"]")
 
@@ -445,6 +447,7 @@ func createAutoscalingOptions() config.AutoscalingOptions {
 			MaxAllocatableDifferenceRatio:    *maxAllocatableDifferenceRatio,
 			MaxFreeDifferenceRatio:           *maxFreeDifferenceRatio,
 		},
+		SkipSimilarNodeGroupRecomputation:       *skipSimilarNodeGroupRecomputation,
 		DynamicNodeDeleteDelayAfterTaintEnabled: *dynamicNodeDeleteDelayAfterTaintEnabled,
 		BypassedSchedulers:                      scheduler_util.GetBypassedSchedulersMap(*bypassedSchedulers),
 		ProvisioningRequestEnabled:              *provisioningRequestsEnabled,