diff --git a/revanced-patcher/src/main/kotlin/app/revanced/patcher/data/BytecodeContext.kt b/revanced-patcher/src/main/kotlin/app/revanced/patcher/data/BytecodeContext.kt
index 34a694ec..fd6a131f 100644
--- a/revanced-patcher/src/main/kotlin/app/revanced/patcher/data/BytecodeContext.kt
+++ b/revanced-patcher/src/main/kotlin/app/revanced/patcher/data/BytecodeContext.kt
@@ -108,7 +108,8 @@ class BytecodeContext internal constructor(private val options: PatcherOptions)
 
             logger.info("Merging integrations")
 
-            // TODO: Multi-thread this.
+            val classMap = classes.associateBy { it.type }
+
             this@Integrations.forEach { integrations ->
                 MultiDexIO.readDexFile(
                     true,
@@ -116,8 +117,8 @@ class BytecodeContext internal constructor(private val options: PatcherOptions)
                     null,
                     null
                 ).classes.forEach classDef@{ classDef ->
-                    val existingClass = classes.find { it.type == classDef.type } ?: run {
-                        logger.fine("Merging $classDef")
+                    val existingClass = classMap[classDef.type] ?: run {
+                        logger.fine("Adding $classDef")
                         classes.add(classDef)
                         return@classDef
                     }
@@ -131,7 +132,6 @@ class BytecodeContext internal constructor(private val options: PatcherOptions)
                     }
                 }
             }
-
             clear()
         }
     }