Basically if you want to prevent reflowing you end up making everything a texture and that leads you to making many many CSS transform changes on every frame. 6

Basically if you want to prevent reflowing you end up making everything a texture and that leads you to making many many CSS transform changes on every frame. 60fps is easy to hit on a modern desktop, but mobile performance requires more effort to achieve an effect that feels natural. The problem with the marshalling is that it is comparatively expensive and a blocking operation, which is not conducive to buttery smooth graphics performance on all platforms.