EncodeToPng that works more smoothly on mobile

On iOS Android - Is it possible for a texture2D to be encoded to png that doesn't freeze the frame for a perceptible second or two?

Here's a snippet example of the freeze delay from a screenshot encoded to png

void screenshot(){ int width = Screen.width; int height = Screen.height; tex = new Texture2D( width, height, TextureFormat.RGB24, false );

         tex.ReadPixels(new Rect(0, 0, width, height), 0, 0 );
              tex.Apply();
     
     // this produces a noticable pause on mobile
     byte[] bytes = tex.EncodeToPNG();
 }