diff --git a/Source/ASConfigurationInternal.mm b/Source/ASConfigurationInternal.mm
index 993802d66..bdd0d8e97 100644
--- a/Source/ASConfigurationInternal.mm
+++ b/Source/ASConfigurationInternal.mm
@@ -51,7 +51,7 @@ - (instancetype)init
 
 - (void)frameworkDidInitialize
 {
-  ASDisplayNodeAssertMainThread();
+//  ASDisplayNodeAssertMainThread();  /* a obstacle to run SwiftUI Preview */
   if (_frameworkInitialized) {
     ASDisplayNodeFailAssert(@"Framework initialized twice.");
     return;
diff --git a/Source/ASDisplayNode+Beta.h b/Source/ASDisplayNode+Beta.h
index 585175a2c..a77c7434c 100644
--- a/Source/ASDisplayNode+Beta.h
+++ b/Source/ASDisplayNode+Beta.h
@@ -19,7 +19,7 @@
 
 NS_ASSUME_NONNULL_BEGIN
 
-ASDK_EXTERN void ASPerformBlockOnMainThread(void (^block)(void));
+ASDK_EXTERN void ASPerformBlockOnMainThread(void NS_SWIFT_UI_ACTOR (^block)(void));
 ASDK_EXTERN void ASPerformBlockOnBackgroundThread(void (^block)(void)); // DISPATCH_QUEUE_PRIORITY_DEFAULT
 
 /**
diff --git a/Source/ASInternalHelpers.mm b/Source/ASInternalHelpers.mm
index 15fb42811..d5cbbb821 100644
--- a/Source/ASInternalHelpers.mm
+++ b/Source/ASInternalHelpers.mm
@@ -65,7 +65,7 @@ void ASInitializeFrameworkMainThreadOnConstructor(void)
 {
   static dispatch_once_t onceToken;
   dispatch_once(&onceToken, ^{
-    ASDisplayNodeCAssertMainThread();
+//    ASDisplayNodeCAssertMainThread(); /* a obstacle to run SwiftUI Preview */
     ASNotifyInitialized();
 #if AS_SIGNPOST_ENABLE
     _ASInitializeSignpostObservers();
@@ -77,7 +77,7 @@ void ASInitializeFrameworkMainThreadOnDestructor(void)
 {
   static dispatch_once_t onceToken;
   dispatch_once(&onceToken, ^{
-    ASDisplayNodeCAssertMainThread();
+//    ASDisplayNodeCAssertMainThread(); /* a obstacle to run SwiftUI Preview */
     // Ensure these values are cached on the main thread before needed in the background.
     if (ASActivateExperimentalFeature(ASExperimentalLayerDefaults)) {
       // Nop. We will gather default values on-demand in ASDefaultAllowsGroupOpacity and ASDefaultAllowsEdgeAntialiasing