diff --git a/cocos/root.ts b/cocos/root.ts
index 5dea025dbe4..269249cb178 100644
--- a/cocos/root.ts
+++ b/cocos/root.ts
@@ -207,9 +207,6 @@ export class Root {
     public set fixedFPS (fps: number) {
         if (fps > 0) {
             this._fixedFPS$ = fps;
-            this._fixedFPSFrameTime = 1000.0 / fps;
-        } else {
-            this._fixedFPSFrameTime = 0;
         }
     }
 
@@ -469,17 +466,6 @@ export class Root {
     public frameMove (deltaTime: number): void {
         this._frameTime$ = deltaTime;
 
-        /*
-        if (this._fixedFPSFrameTime > 0) {
-
-            const elapsed = this._frameTime * 1000.0;
-            if (this._fixedFPSFrameTime > elapsed) {
-
-                setTimeout(function () {}, this._fixedFPSFrameTime - elapsed);
-            }
-        }
-        */
-
         ++this._frameCount$;
         this._cumulativeTime$ += deltaTime;
         this._fpsTime$ += deltaTime;
diff --git a/cocos/tween/actions/action-manager.ts b/cocos/tween/actions/action-manager.ts
index b2257125af9..e2c98d44238 100644
--- a/cocos/tween/actions/action-manager.ts
+++ b/cocos/tween/actions/action-manager.ts
@@ -26,7 +26,7 @@
 */
 
 import { errorID, logID } from '../../core/platform/debug';
-import { Action } from './action';
+import { Action, ActionEnum } from './action';
 import { isCCObject } from '../../core/data/object';
 import { Node, NodeEventType } from '../../scene-graph';
 
@@ -267,7 +267,7 @@ export class ActionManager {
      * @param {T} target
      */
     removeActionByTag<T> (tag: number, target?: T): void {
-        if (tag === Action.TAG_INVALID) logID(1002);
+        if (tag === ActionEnum.TAG_INVALID) logID(1002);
 
         const hashTargets = this._hashTargets;
         if (target) {
@@ -290,7 +290,7 @@ export class ActionManager {
      * @param {T} target
      */
     removeAllActionsByTag<T> (tag: number, target?: T): void {
-        if (tag === Action.TAG_INVALID) logID(1002);
+        if (tag === ActionEnum.TAG_INVALID) logID(1002);
 
         const hashTargets = this._hashTargets;
         if (target) {
@@ -314,7 +314,7 @@ export class ActionManager {
      * @return {Action|null}  return the Action with the given tag on success
      */
     getActionByTag<T> (tag: number, target: T): Action | null {
-        if (tag === Action.TAG_INVALID) logID(1004);
+        if (tag === ActionEnum.TAG_INVALID) logID(1004);
 
         const element = this._hashTargets.get(target);
         if (element) {