As we all know, saveLayer has a bad impact on performance, related ​discussions include: #92874 (comment)

Now that, ClipPathLayer/ClipRectLayer/ClipRRectLayer/PhysicalShapeLayer will use saveLayer when clipBehavior is set to Clip::antiAliasWithSaveLayer. Although Clip::antiAliasWithSaveLayer is not recommended and should be less needed, in fact, we found that some of our developers still use it in daily development.

Therefore, it will help to optimize performance if the raster cache can be used to reduce the use of saveLayer in those cases.