diff --git a/src/GToolkit-Debugger/GtAbstractExpandableStackElement.class.st b/src/GToolkit-Debugger/GtAbstractExpandableStackElement.class.st
index 83da23ce..74fbd670 100644
--- a/src/GToolkit-Debugger/GtAbstractExpandableStackElement.class.st
+++ b/src/GToolkit-Debugger/GtAbstractExpandableStackElement.class.st
@@ -50,6 +50,7 @@ GtAbstractExpandableStackElement >> buildStackFramesList [
 
 			eachCoderElement id: (GtExpandableContextMethodCoderId indexed: eachIndex).
 			eachCoderElement coderViewModel: eachCoderUIModel ];
+		"the list is initialized with an empty stream to reuse the same stream items provider"
 		stream: AsyncEmptyStream new
 ]
 
@@ -104,7 +105,6 @@ GtAbstractExpandableStackElement >> initializeStackList [
 	| stackFramesList |
 	stackFramesList := self buildStackFramesList.
 	stackFramesList padding: (BlInsets all: 10).
-	stackFramesList items: OrderedCollection new.
 	self addChild: stackFramesList as: #expandableFrames
 ]
 
@@ -132,6 +132,7 @@ GtAbstractExpandableStackElement >> openFirstNonFilteredContextFrom: aStream [
 	| anItemsProvider aPreloadPromise |
 	anItemsProvider := BrStreamItemsProvider new.
 	anItemsProvider stream: aStream.
+	anItemsProvider executionConfiguration: GtMoldableDebugger defaultFutureExecutionConfiguration.
 	aPreloadPromise := anItemsProvider
 			itemSuchThat: [ :eachCoder | (self shouldJumpOverCoverViewModel: eachCoder) not ]
 			do: [ :anIndex :isSynchronous | 
diff --git a/src/GToolkit-Debugger/GtMoldableDebugger.class.st b/src/GToolkit-Debugger/GtMoldableDebugger.class.st
index f11b057f..c3e45a3f 100644
--- a/src/GToolkit-Debugger/GtMoldableDebugger.class.st
+++ b/src/GToolkit-Debugger/GtMoldableDebugger.class.st
@@ -32,6 +32,13 @@ GtMoldableDebugger class >> closeAllDebuggers [
 	self flag: 'Take the new GT debuggers into account'.
 ]
 
+{ #category : #accessing }
+GtMoldableDebugger class >> defaultFutureExecutionConfiguration [
+	^ AsyncFutureExecutionConfiguration new
+		highPriority;
+		customGroup: #DebuggerScrollingList
+]
+
 { #category : #'settings api' }
 GtMoldableDebugger class >> defaultLogFileName [
 	^ 'PharoDebug.log'
diff --git a/src/GToolkit-Debugger/GtPharoStackElement.class.st b/src/GToolkit-Debugger/GtPharoStackElement.class.st
index feaf4076..c6972166 100644
--- a/src/GToolkit-Debugger/GtPharoStackElement.class.st
+++ b/src/GToolkit-Debugger/GtPharoStackElement.class.st
@@ -308,7 +308,10 @@ GtPharoStackElement >> updateIndexes [
 GtPharoStackElement >> updateReceiversIndex [
 	self
 		enqueueTask: (BlTaskAction new
-				action: [ receiversIndex stream: (self class receiversStreamFor: stackModel) ])
+				action: [
+					receiversIndex
+						stream: (self class receiversStreamFor: stackModel)
+						executionConfiguration: GtMoldableDebugger defaultFutureExecutionConfiguration ])
 ]
 
 { #category : #updating }
@@ -333,7 +336,10 @@ GtPharoStackElement >> updateReceiversIndexTo: aContext [
 GtPharoStackElement >> updateStackIndex [
 	self
 		enqueueTask: (BlTaskAction new
-				action: [ self stackIndexList stream: stackModel contextStream.
+				action: [
+					self stackIndexList
+						stream: stackModel contextStream
+						executionConfiguration: GtMoldableDebugger defaultFutureExecutionConfiguration.
 					self stackIndexList scrollToIndex: 1 ])
 ]