diff --git a/packages/core/src/Camera.ts b/packages/core/src/Camera.ts
index d2ecd294b9..de6f78a562 100644
--- a/packages/core/src/Camera.ts
+++ b/packages/core/src/Camera.ts
@@ -825,7 +825,11 @@ export class Camera extends Component {
   }
 
   private _checkMainCanvasAntialiasWaste(): void {
-    if (this.independentCanvasEnabled && Vector4.equals(this._viewport, PipelineUtils.defaultViewport)) {
+    if (
+      this._phasedActiveInScene &&
+      this.independentCanvasEnabled &&
+      Vector4.equals(this._viewport, PipelineUtils.defaultViewport)
+    ) {
       Logger.warn(
         "Camera use independent canvas and viewport cover the whole screen, it is recommended to disable antialias, depth and stencil to save memory when create engine."
       );
diff --git a/packages/core/src/postProcess/PostProcessManager.ts b/packages/core/src/postProcess/PostProcessManager.ts
index b973aecd36..46819d7319 100644
--- a/packages/core/src/postProcess/PostProcessManager.ts
+++ b/packages/core/src/postProcess/PostProcessManager.ts
@@ -12,6 +12,11 @@ import { BloomEffect, TonemappingEffect } from "./effects";
 export class _PostProcessManager {
   static readonly UBER_SHADER_NAME = "UberPost";
 
+  /**
+   * Whether the post process manager is active.
+   */
+  isActive = true;
+
   /** @internal */
   _uberMaterial: Material;
   /** @internal */
@@ -23,7 +28,7 @@ export class _PostProcessManager {
    * Whether has active post process effect.
    */
   get hasActiveEffect(): boolean {
-    return this._bloomEffect.enabled || this._tonemappingEffect.enabled;
+    return this.isActive && (this._bloomEffect.enabled || this._tonemappingEffect.enabled);
   }
 
   /**