在添加到主屏幕之前“预加载”apple-touch-precomposed-icon？

Is there any way to "preload" the apple-touch-precomposed-icon so that is already loaded before it is addded to the homescreen? As it stands right now (from what I've seen), you tap "Add to Home Screen" from Safari, and it uses a screenshot of the page until the icon is downloaded. I assume this is to preserve bandwidth upon page load.Is there any way to "preload" the apple-touch-p