diff --git a/ci/licenses_golden/licenses_flutter b/ci/licenses_golden/licenses_flutter
index 477bd20564f91..a6644dfc5fc9b 100644
--- a/ci/licenses_golden/licenses_flutter
+++ b/ci/licenses_golden/licenses_flutter
@@ -40598,6 +40598,7 @@ ORIGIN: ../../../flutter/lib/web_ui/lib/src/engine/shadow.dart + ../../../flutte
 ORIGIN: ../../../flutter/lib/web_ui/lib/src/engine/skwasm/skwasm_impl.dart + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/lib/web_ui/lib/src/engine/skwasm/skwasm_impl/canvas.dart + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/lib/web_ui/lib/src/engine/skwasm/skwasm_impl/codecs.dart + ../../../flutter/LICENSE
+ORIGIN: ../../../flutter/lib/web_ui/lib/src/engine/skwasm/skwasm_impl/dart_js_conversion.dart + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/lib/web_ui/lib/src/engine/skwasm/skwasm_impl/filters.dart + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/lib/web_ui/lib/src/engine/skwasm/skwasm_impl/font_collection.dart + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/lib/web_ui/lib/src/engine/skwasm/skwasm_impl/image.dart + ../../../flutter/LICENSE
@@ -40634,6 +40635,7 @@ ORIGIN: ../../../flutter/lib/web_ui/lib/src/engine/skwasm/skwasm_impl/shaders.da
 ORIGIN: ../../../flutter/lib/web_ui/lib/src/engine/skwasm/skwasm_impl/surface.dart + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/lib/web_ui/lib/src/engine/skwasm/skwasm_impl/vertices.dart + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/lib/web_ui/lib/src/engine/skwasm/skwasm_stub.dart + ../../../flutter/LICENSE
+ORIGIN: ../../../flutter/lib/web_ui/lib/src/engine/skwasm/skwasm_stub/dart_js_conversion.dart + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/lib/web_ui/lib/src/engine/skwasm/skwasm_stub/renderer.dart + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/lib/web_ui/lib/src/engine/svg.dart + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/lib/web_ui/lib/src/engine/test_embedding.dart + ../../../flutter/LICENSE
@@ -43471,6 +43473,7 @@ FILE: ../../../flutter/lib/web_ui/lib/src/engine/shadow.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/skwasm/skwasm_impl.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/skwasm/skwasm_impl/canvas.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/skwasm/skwasm_impl/codecs.dart
+FILE: ../../../flutter/lib/web_ui/lib/src/engine/skwasm/skwasm_impl/dart_js_conversion.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/skwasm/skwasm_impl/filters.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/skwasm/skwasm_impl/font_collection.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/skwasm/skwasm_impl/image.dart
@@ -43507,6 +43510,7 @@ FILE: ../../../flutter/lib/web_ui/lib/src/engine/skwasm/skwasm_impl/shaders.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/skwasm/skwasm_impl/surface.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/skwasm/skwasm_impl/vertices.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/skwasm/skwasm_stub.dart
+FILE: ../../../flutter/lib/web_ui/lib/src/engine/skwasm/skwasm_stub/dart_js_conversion.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/skwasm/skwasm_stub/renderer.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/svg.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/test_embedding.dart
diff --git a/lib/web_ui/lib/src/engine/canvaskit/native_memory.dart b/lib/web_ui/lib/src/engine/canvaskit/native_memory.dart
index 4b5c85dff526d..0ef83b4b9810e 100644
--- a/lib/web_ui/lib/src/engine/canvaskit/native_memory.dart
+++ b/lib/web_ui/lib/src/engine/canvaskit/native_memory.dart
@@ -20,9 +20,9 @@ import 'package:ui/src/engine.dart';
 /// 4. GC decides to perform a GC cycle and collects CkPaint.
 /// 5. The finalizer function is called with the SkPaint as the sole argument.
 /// 6. We call `delete` on SkPaint.
-DomFinalizationRegistry _finalizationRegistry = createDomFinalizationRegistry(
+DomFinalizationRegistry _finalizationRegistry = DomFinalizationRegistry(
   (JSBoxedDartObject boxedUniq) {
-    final UniqueRef<Object> uniq = boxedUniq.toDart as UniqueRef<Object>;
+    final UniqueRef<Object> uniq = boxedUniq.fromJSWrapper as UniqueRef<Object>;
     uniq.collect();
   }.toJS
 );
@@ -34,7 +34,7 @@ NativeMemoryFinalizationRegistry nativeMemoryFinalizationRegistry = NativeMemory
 class NativeMemoryFinalizationRegistry {
   void register(Object owner, UniqueRef<Object> ref) {
     if (browserSupportsFinalizationRegistry) {
-      _finalizationRegistry.register(owner, ref.toJSBox);
+      _finalizationRegistry.register(owner.toJSWrapper, ref.toJSWrapper);
     }
   }
 }
diff --git a/lib/web_ui/lib/src/engine/dom.dart b/lib/web_ui/lib/src/engine/dom.dart
index 386666d6797ae..8dfa57b2a9420 100644
--- a/lib/web_ui/lib/src/engine/dom.dart
+++ b/lib/web_ui/lib/src/engine/dom.dart
@@ -9,6 +9,7 @@ import 'dart:typed_data';
 
 import 'package:js/js_util.dart' as js_util;
 import 'package:meta/meta.dart';
+import 'package:ui/src/engine/skwasm/skwasm_stub.dart' if (dart.library.ffi) 'package:ui/src/engine/skwasm/skwasm_impl.dart';
 
 import 'browser_detection.dart';
 
@@ -37,6 +38,15 @@ import 'browser_detection.dart';
 /// used carefully and only on types that are known to not contains `JSNull` and
 /// `JSUndefined`.
 extension ObjectToJSAnyExtension on Object {
+  // Once `Object.toJSBox` is faster (see
+  // https://github.com/dart-lang/sdk/issues/55183) we can remove this
+  // backend-specific workaround.
+  @pragma('wasm:prefer-inline')
+  @pragma('dart2js:tryInline')
+  JSAny get toJSWrapper => dartToJsWrapper(this);
+
+  @pragma('wasm:prefer-inline')
+  @pragma('dart2js:tryInline')
   JSAny get toJSAnyShallow {
     if (isWasm) {
       return toJSAnyDeep;
@@ -45,10 +55,18 @@ extension ObjectToJSAnyExtension on Object {
     }
   }
 
+  @pragma('wasm:prefer-inline')
+  @pragma('dart2js:tryInline')
   JSAny get toJSAnyDeep => js_util.jsify(this) as JSAny;
 }
 
 extension JSAnyToObjectExtension on JSAny {
+  @pragma('wasm:prefer-inline')
+  @pragma('dart2js:tryInline')
+  Object get fromJSWrapper => jsWrapperToDart(this);
+
+  @pragma('wasm:prefer-inline')
+  @pragma('dart2js:tryInline')
   Object get toObjectShallow {
     if (isWasm) {
       return toObjectDeep;
@@ -57,6 +75,8 @@ extension JSAnyToObjectExtension on JSAny {
     }
   }
 
+  @pragma('wasm:prefer-inline')
+  @pragma('dart2js:tryInline')
   Object get toObjectDeep => js_util.dartify(this)!;
 }
 
@@ -3648,38 +3668,24 @@ extension DomTextDecoderExtension on DomTextDecoder {
 
 @JS('window.FinalizationRegistry')
 @staticInterop
-class DomFinalizationRegistry {}
-
-@JS('window.FinalizationRegistry')
-external JSAny? get _finalizationRegistryConstructor;
-
-// Note: We don't use a factory constructor here because there is an issue in
-// dart2js that causes a crash in the Google3 build if we do use a factory
-// constructor. See b/284478971
-DomFinalizationRegistry createDomFinalizationRegistry(JSFunction cleanup) =>
-    js_util.callConstructor(
-        _finalizationRegistryConstructor!.toObjectShallow, <Object>[cleanup]);
+class DomFinalizationRegistry {
+  external factory DomFinalizationRegistry(JSFunction cleanup);
+}
 
 extension DomFinalizationRegistryExtension on DomFinalizationRegistry {
   @JS('register')
-  external JSVoid _register1(JSAny target, JSAny value);
+  external JSVoid register(JSAny target, JSAny value);
 
   @JS('register')
-  external JSVoid _register2(JSAny target, JSAny value, JSAny token);
-  void register(Object target, Object value, [Object? token]) {
-    if (token != null) {
-      _register2(
-          target.toJSAnyShallow, value.toJSAnyShallow, token.toJSAnyShallow);
-    } else {
-      _register1(target.toJSAnyShallow, value.toJSAnyShallow);
-    }
-  }
+  external JSVoid registerWithToken(JSAny target, JSAny value, JSAny token);
 
   @JS('unregister')
-  external JSVoid _unregister(JSAny token);
-  void unregister(Object token) => _unregister(token.toJSAnyShallow);
+  external JSVoid unregister(JSAny token);
 }
 
+@JS('window.FinalizationRegistry')
+external JSAny? get _finalizationRegistryConstructor;
+
 /// Whether the current browser supports `FinalizationRegistry`.
 bool browserSupportsFinalizationRegistry =
     _finalizationRegistryConstructor != null;
diff --git a/lib/web_ui/lib/src/engine/skwasm/skwasm_impl.dart b/lib/web_ui/lib/src/engine/skwasm/skwasm_impl.dart
index fd370c7a0fb18..e36e4359c67bc 100644
--- a/lib/web_ui/lib/src/engine/skwasm/skwasm_impl.dart
+++ b/lib/web_ui/lib/src/engine/skwasm/skwasm_impl.dart
@@ -11,6 +11,7 @@ import 'dart:ffi';
 
 export 'skwasm_impl/canvas.dart';
 export 'skwasm_impl/codecs.dart';
+export 'skwasm_impl/dart_js_conversion.dart';
 export 'skwasm_impl/filters.dart';
 export 'skwasm_impl/font_collection.dart';
 export 'skwasm_impl/image.dart';
diff --git a/lib/web_ui/lib/src/engine/skwasm/skwasm_impl/dart_js_conversion.dart b/lib/web_ui/lib/src/engine/skwasm/skwasm_impl/dart_js_conversion.dart
new file mode 100644
index 0000000000000..dbde1bee5cd5d
--- /dev/null
+++ b/lib/web_ui/lib/src/engine/skwasm/skwasm_impl/dart_js_conversion.dart
@@ -0,0 +1,16 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:_wasm';
+import 'dart:js_interop';
+
+@pragma('wasm:prefer-inline')
+@pragma('dart2js:tryInline')
+JSAny dartToJsWrapper(Object object) =>
+    WasmAnyRef.fromObject(object).externalize().toJS;
+
+@pragma('wasm:prefer-inline')
+@pragma('dart2js:tryInline')
+Object jsWrapperToDart(JSAny jsWrapper) =>
+    externRefForJSAny(jsWrapper).internalize()!.toObject();
diff --git a/lib/web_ui/lib/src/engine/skwasm/skwasm_impl/memory.dart b/lib/web_ui/lib/src/engine/skwasm/skwasm_impl/memory.dart
index 030122c83f5e3..c0f9a8470b3ba 100644
--- a/lib/web_ui/lib/src/engine/skwasm/skwasm_impl/memory.dart
+++ b/lib/web_ui/lib/src/engine/skwasm/skwasm_impl/memory.dart
@@ -28,7 +28,7 @@ typedef DisposeFunction<T extends NativeType> = void Function(Pointer<T>);
 
 class SkwasmFinalizationRegistry<T extends NativeType> {
   SkwasmFinalizationRegistry(this.dispose)
-    : registry = createDomFinalizationRegistry(((JSNumber address) =>
+    : registry = DomFinalizationRegistry(((JSNumber address) =>
       dispose(Pointer<T>.fromAddress(address.toDartDouble.toInt()))
     ).toJS);
 
@@ -36,11 +36,14 @@ class SkwasmFinalizationRegistry<T extends NativeType> {
   final DisposeFunction<T> dispose;
 
   void register(SkwasmObjectWrapper<T> wrapper) {
-    registry.register(wrapper, wrapper.handle.address, wrapper);
+    final JSAny jsWrapper = wrapper.toJSWrapper;
+    registry.registerWithToken(
+        jsWrapper, wrapper.handle.address.toJS, jsWrapper);
   }
 
   void evict(SkwasmObjectWrapper<T> wrapper) {
-    registry.unregister(wrapper);
+    final JSAny jsWrapper = wrapper.toJSWrapper;
+    registry.unregister(jsWrapper);
     dispose(wrapper.handle);
   }
 }
diff --git a/lib/web_ui/lib/src/engine/skwasm/skwasm_stub.dart b/lib/web_ui/lib/src/engine/skwasm/skwasm_stub.dart
index 382d34840e9f6..50c1791aecc2e 100644
--- a/lib/web_ui/lib/src/engine/skwasm/skwasm_stub.dart
+++ b/lib/web_ui/lib/src/engine/skwasm/skwasm_stub.dart
@@ -6,4 +6,5 @@
 // ignore: unnecessary_library_directive
 library skwasm_stub;
 
+export 'skwasm_stub/dart_js_conversion.dart';
 export 'skwasm_stub/renderer.dart';
diff --git a/lib/web_ui/lib/src/engine/skwasm/skwasm_stub/dart_js_conversion.dart b/lib/web_ui/lib/src/engine/skwasm/skwasm_stub/dart_js_conversion.dart
new file mode 100644
index 0000000000000..b05af5dcff599
--- /dev/null
+++ b/lib/web_ui/lib/src/engine/skwasm/skwasm_stub/dart_js_conversion.dart
@@ -0,0 +1,13 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:js_interop';
+
+@pragma('wasm:prefer-inline')
+@pragma('dart2js:tryInline')
+JSAny dartToJsWrapper(Object object) => object as JSAny;
+
+@pragma('wasm:prefer-inline')
+@pragma('dart2js:tryInline')
+Object jsWrapperToDart(JSAny jsWrapper) => jsWrapper;
diff --git a/lib/web_ui/test/canvaskit/canvaskit_api_test.dart b/lib/web_ui/test/canvaskit/canvaskit_api_test.dart
index 6a1fea063ef34..69d9f6bf85967 100644
--- a/lib/web_ui/test/canvaskit/canvaskit_api_test.dart
+++ b/lib/web_ui/test/canvaskit/canvaskit_api_test.dart
@@ -1928,8 +1928,8 @@ void _paragraphTests() {
     // FinalizationRegistry because it depends on GC, which cannot be controlled,
     // So the test simply tests that a FinalizationRegistry can be constructed
     // and its `register` method can be called.
-    final DomFinalizationRegistry registry = createDomFinalizationRegistry((String arg) {}.toJS);
-    registry.register(Object(), Object());
+    final DomFinalizationRegistry registry = DomFinalizationRegistry((String arg) {}.toJS);
+    registry.register(Object().toJSWrapper, Object().toJSWrapper);
   });
 }