diff --git a/idea/idea-completion/src/org/jetbrains/kotlin/idea/completion/CompletionSession.kt b/idea/idea-completion/src/org/jetbrains/kotlin/idea/completion/CompletionSession.kt
index efc75036d89..dce8667ade5 100644
--- a/idea/idea-completion/src/org/jetbrains/kotlin/idea/completion/CompletionSession.kt
+++ b/idea/idea-completion/src/org/jetbrains/kotlin/idea/completion/CompletionSession.kt
@@ -393,7 +393,8 @@ abstract class CompletionSession(protected val configuration: CompletionSessionC
     private fun createLookupElementFactory(callType: CallType<*>?, receiverTypes: Collection<KotlinType>?): LookupElementFactory {
         val contextVariablesProvider = {
             nameExpression?.let {
-                referenceVariantsHelper.getReferenceVariants(it, CallTypeAndReceiver.DEFAULT, DescriptorKindFilter.VARIABLES, nameFilter = { true })
+                val descriptorFilter = DescriptorKindFilter.VARIABLES exclude DescriptorKindExclude.Extensions // we exclude extensions by performance reasons
+                referenceVariantsHelper.getReferenceVariants(it, CallTypeAndReceiver.DEFAULT, descriptorFilter, nameFilter = { true })
                         .map { it as VariableDescriptor }
             } ?: emptyList()
         }
diff --git a/idea/idea-completion/testData/basic/common/highOrderFunctions/ContextVariables1.kt b/idea/idea-completion/testData/basic/common/highOrderFunctions/ContextVariables1.kt
index d8891297797..20fa7a3648d 100644
--- a/idea/idea-completion/testData/basic/common/highOrderFunctions/ContextVariables1.kt
+++ b/idea/idea-completion/testData/basic/common/highOrderFunctions/ContextVariables1.kt
@@ -26,5 +26,8 @@ val String.wrongExtension: () -> Unit
 // EXIST: { itemText: "xfoo", tailText: "(local) (<root>)", typeText: "Unit" }
 // EXIST: { itemText: "xfoo", tailText: "(global) (<root>)", typeText: "Unit" }
 // EXIST: { itemText: "xfoo", tailText: "(publicVal) (<root>)", typeText: "Unit" }
-// EXIST: { itemText: "xfoo", tailText: "(extension) (<root>)", typeText: "Unit" }
+
+// excluded by performance reasons:
+// ABSENT: { itemText: "xfoo", tailText: "(extension) (<root>)", typeText: "Unit" }
+
 // NOTHING_ELSE
diff --git a/idea/idea-completion/testData/basic/common/highOrderFunctions/ContextVariables2.kt b/idea/idea-completion/testData/basic/common/highOrderFunctions/ContextVariables2.kt
index 4ace842af9b..8b5de495324 100644
--- a/idea/idea-completion/testData/basic/common/highOrderFunctions/ContextVariables2.kt
+++ b/idea/idea-completion/testData/basic/common/highOrderFunctions/ContextVariables2.kt
@@ -26,5 +26,8 @@ val String.wrongExtension: () -> Unit
 // EXIST: { itemText: "xfoo", tailText: "(local) for String in <root>", typeText: "Unit" }
 // EXIST: { itemText: "xfoo", tailText: "(global) for String in <root>", typeText: "Unit" }
 // EXIST: { itemText: "xfoo", tailText: "(publicVal) for String in <root>", typeText: "Unit" }
-// EXIST: { itemText: "xfoo", tailText: "(extension) for String in <root>", typeText: "Unit" }
+
+// excluded by performance reasons:
+// ABSENT: { itemText: "xfoo", tailText: "(extension) for String in <root>", typeText: "Unit" }
+
 // NOTHING_ELSE