diff --git a/benchmarks/ordered_set_benchmark.py b/benchmarks/ordered_set_benchmark.py
new file mode 100644
index 0000000..43ae192
--- /dev/null
+++ b/benchmarks/ordered_set_benchmark.py
@@ -0,0 +1,110 @@
+import timeit
+from functools import partial
+from random import randint
+
+from ordered_set import OrderedSet as OS2
+
+try:
+    from orderedset import OrderedSet as OS1
+except ImportError:
+    # currently orderedset fails to install on Python 3.10, 3.11
+    # https://github.com/simonpercivall/orderedset/issues/36#issuecomment-1424309665
+    print("orderedset is not installed, using ordered_set twice")
+    OS1 = OS2
+from ordered_set import StableSet as OS3
+try:
+    from sortedcollections import OrderedSet as OS4
+except ImportError:
+    print("sortedcollections is not installed, using ordered_set twice")
+    OS4 = OS2
+
+
+item_count = 10_000
+item_range = item_count * 2
+items = [randint(0, item_range) for _ in range(item_count)]
+items_b = [randint(0, item_range) for _ in range(item_count)]
+
+oset1a = OS1(items)
+oset2a = OS2(items)
+oset1b = OS1(items_b)
+oset2b = OS2(items_b)
+assert oset1a.difference(oset1b) == oset2a.difference(oset2b)
+assert oset1a.intersection(oset1b) == oset2a.intersection(oset2b)
+
+oset1c = OS1(items)
+oset2c = OS2(items)
+oset1c.add(item_range + 1)
+oset2c.add(item_range + 1)
+assert oset1c == oset2c
+
+for i in range(item_range):
+    assert (i in oset1a) == (i in oset2a)
+    if i in oset1a:
+        assert oset1a.index(i) == oset2a.index(i)
+
+
+def init_set(T, items) -> set:
+    return T(items)
+
+
+def init_set_list(T, items) -> list:
+    return list(T(items))
+
+
+def init_set_d(items) -> dict:
+    return dict.fromkeys(items)
+
+
+def init_set_d_list(items) -> list:
+    return list(dict.fromkeys(items))
+
+
+def update(s: set, items) -> set:
+    s.update(items)
+    return s
+
+
+def update_d(s: dict, items) -> dict:
+    d2 = dict.fromkeys(items)
+    s.update(d2)
+    return s
+
+
+ordered_sets_types = [OS1, OS2, OS3, OS4]
+set_types = [set] + ordered_sets_types
+
+oss = [init_set(T, items) for T in set_types]
+od = init_set_d(items)
+
+osls = [init_set_list(T, items) for T in set_types[1:]] + [init_set_d_list(items)]
+for x in osls:
+    assert osls[0] == x
+
+osls = [update(init_set(T, items), items_b) for T in ordered_sets_types[:-1]] + [
+    update_d(init_set_d(items), items_b)
+]
+osls = [list(x) for x in osls]
+for x in osls:
+    assert osls[0] == x
+
+number = 10000
+repeats = 4
+for i in range(repeats):
+    print(f"----- {i} ------")
+
+    print("-- init set like --")
+    print(f"d: {timeit.timeit(partial(init_set_d, items),number=number)=}")
+    for idx, T in enumerate(set_types):
+        print(f"{idx}: {timeit.timeit(partial(init_set, T, items),number=number)=}")
+
+    print("-- unique list --")
+    print(f"d: {timeit.timeit(partial(init_set_d, items),number=number)=}")
+    for idx, T in enumerate(set_types):
+        print(
+            f"{idx}: {timeit.timeit(partial(init_set_list, T, items),number=number)=}"
+        )
+
+    print("-- update set like --")
+    print(f"d: {timeit.timeit(partial(update_d, od, items_b),number=number)=}")
+    for idx, os in enumerate(oss[:-1]):
+        print(f"{idx}: {timeit.timeit(partial(update, os, items_b),number=number)=}")