Convert Texture to Texture2d takes a lot of time in android device.

I have a function that converting a RGB565 Texture2d to a RGB24Texture2d.

I use Texture2d.ReadPixs() api and it was successfully achieved but when it's running on android It will take 50 milliseconds on Texture2d.ReadPixs() and the readed size is just 640*480.

Is there any other solution to fix it?

Thank you in advance！

     public static void textureToTexture2D(Texture texture, Texture2D texture2D)
     {
         if (texture == null)
             throw new ArgumentNullException("texture == null");
         if (texture2D == null)
             throw new ArgumentNullException("texture2D == null");

         if (texture.width != texture2D.width || texture.height != texture2D.height)
             throw new ArgumentException("texture and texture2D need to be the same size.");

         RenderTexture prevRT = RenderTexture.active;

         if (texture is RenderTexture)
         {
             RenderTexture.active = (RenderTexture)texture;
             
             texture2D.ReadPixels(new UnityEngine.Rect(0f, 0f, texture.width, texture.height), 0, 0, false);
             texture2D.Apply(false, false);

         }
         else
         {
             RenderTexture tempRT = RenderTexture.GetTemporary(texture.width, texture.height, 0, RenderTextureFormat.ARGB32);
             Graphics.Blit(texture, tempRT);

             RenderTexture.active = tempRT;
            //it takes the most time on the function about 50ms
             texture2D.ReadPixels(new UnityEngine.Rect(0f, 0f, texture.width, texture.height), 0, 0, false);
             texture2D.Apply(false, false);
             RenderTexture.ReleaseTemporary(tempRT);
         }

         RenderTexture.active = prevRT;
     }

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