diff --git a/React/Base/RCTRootView.m b/React/Base/RCTRootView.m
index 63e0a410fd7247..66f7b1eaf472fe 100644
--- a/React/Base/RCTRootView.m
+++ b/React/Base/RCTRootView.m
@@ -33,10 +33,6 @@
 #import "RCTDevMenu.h"
 #endif // ]TODO(OSS Candidate ISS#2710739)
 
-#if TARGET_OS_OSX // [TODO(macOS GH#774)
-#define RCT_LAYOUT_THROTTLE 0.25
-#endif // ]TODO(macOS GH#774)
-
 NSString *const RCTContentDidAppearNotification = @"RCTContentDidAppearNotification";
 
 @interface RCTUIManager (RCTRootView)
@@ -51,11 +47,6 @@ @implementation RCTRootView {
   RCTRootContentView *_contentView;
   BOOL _passThroughTouches;
   CGSize _intrinsicContentSize;
-
-#if TARGET_OS_OSX // [TODO(macOS GH#774)
-  NSDate *_lastLayout;
-  BOOL _throttleLayout;
-#endif // ]TODO(macOS GH#774)
 }
 
 - (instancetype)initWithFrame:(CGRect)frame
@@ -85,10 +76,6 @@ - (instancetype)initWithFrame:(CGRect)frame
     _sizeFlexibility = RCTRootViewSizeFlexibilityNone;
     _minimumSize = CGSizeZero;
 
-#if TARGET_OS_OSX // [TODO(macOS GH#774)
-    _lastLayout = [NSDate new];
-#endif // ]TODO(macOS GH#774)
-
     [[NSNotificationCenter defaultCenter] addObserver:self
                                              selector:@selector(bridgeDidReload)
                                                  name:RCTJavaScriptWillStartLoadingNotification
@@ -182,35 +169,6 @@ - (CGSize)sizeThatFits:(CGSize)size
   return fitSize;
 }
 
-#if TARGET_OS_OSX // [TODO(macOS GH#774)
-// TODO: https://github.com/microsoft/react-native-macos/issues/459
-// This is a workaround for window resizing events overloading the shadow queue:
-//  - https://github.com/microsoft/react-native-macos/issues/322
-//  - https://github.com/microsoft/react-native-macos/issues/422
-// We should revisit this issue when we switch over to Fabric.
-- (void)layout
-{
-  if (self.window != nil && !_throttleLayout) {
-    NSTimeInterval interval = [[NSDate date] timeIntervalSinceDate:_lastLayout];
-    if (interval >= RCT_LAYOUT_THROTTLE) {
-      _lastLayout = [NSDate new];
-      [self layoutSubviews];
-    } else {
-      _throttleLayout = YES;
-      __weak typeof(self) weakSelf = self;
-      int64_t delta = (RCT_LAYOUT_THROTTLE - interval) * NSEC_PER_SEC;
-      dispatch_after(dispatch_time(DISPATCH_TIME_NOW, delta), dispatch_get_main_queue(), ^{
-        typeof(self) strongSelf = weakSelf;
-        if (strongSelf != nil) {
-          strongSelf->_throttleLayout = NO;
-          [strongSelf setNeedsLayout];
-        }
-      });
-    }
-  }
-}
-#endif // ]TODO(macOS GH#774)
-
 - (void)layoutSubviews
 {
   [super layoutSubviews];
diff --git a/React/Modules/RCTUIManager.m b/React/Modules/RCTUIManager.m
index 721047c4aaaba4..7b3057ed65c438 100644
--- a/React/Modules/RCTUIManager.m
+++ b/React/Modules/RCTUIManager.m
@@ -412,21 +412,34 @@ - (void)_executeBlockWithShadowView:(void (^)(RCTShadowView *shadowView))block f
 - (void)setAvailableSize:(CGSize)availableSize forRootView:(RCTUIView *)rootView // TODO(macOS ISS#3536887)
 {
   RCTAssertMainQueue();
-  [self
-      _executeBlockWithShadowView:^(RCTShadowView *shadowView) {
-        RCTAssert(
-            [shadowView isKindOfClass:[RCTRootShadowView class]], @"Located shadow view is actually not root view.");
 
-        RCTRootShadowView *rootShadowView = (RCTRootShadowView *)shadowView;
+  void (^block)(RCTShadowView *) = ^(RCTShadowView *shadowView) {
+    RCTAssert(
+        [shadowView isKindOfClass:[RCTRootShadowView class]], @"Located shadow view is actually not root view.");
 
-        if (CGSizeEqualToSize(availableSize, rootShadowView.availableSize)) {
-          return;
-        }
+    RCTRootShadowView *rootShadowView = (RCTRootShadowView *)shadowView;
 
-        rootShadowView.availableSize = availableSize;
-        [self setNeedsLayout];
-      }
-                           forTag:rootView.reactTag];
+    if (CGSizeEqualToSize(availableSize, rootShadowView.availableSize)) {
+      return;
+    }
+
+    rootShadowView.availableSize = availableSize;
+    [self setNeedsLayout];
+  };
+
+#if TARGET_OS_OSX // [TODO(macOS GH#744)
+  if (rootView.inLiveResize) {
+    NSNumber* tag = rootView.reactTag;
+    // Synchronously relayout to prevent "tearing" when resizing windows.
+    // Still run block asynchronously below so it "wins" after any in-flight layout.
+    RCTUnsafeExecuteOnUIManagerQueueSync(^{
+      RCTShadowView *shadowView = self->_shadowViewRegistry[tag];
+      block(shadowView);
+    });
+  }
+#endif // ]TODO(macOS GH#744)
+
+  [self _executeBlockWithShadowView:block forTag:rootView.reactTag];
 }
 
 - (void)setLocalData:(NSObject *)localData forView:(RCTUIView *)view // TODO(macOS ISS#3536887)