We tested it in mobile, but several people pointed out that we have more performance work to do to make sure that the animation is fast on lower-end hardware. I don't know what phone you're using, but we'll get it fixed regardless.
Good choice in my opinion, as I hadn't even noticed the animation existed until I looked for something that might make the scrolling slow.
I opened up Activity Monitor and CPU use looked normal but it showed the GPU was pegged at 100% as long as that page was open.