Use will-change:transform for smoother mobile scrolling

[nolanlawson]

This improves mobile scrolling, especially on mobile Chrome/Android. It provides a hint to the browser to move the scrollable element to a layer on the GPU, which leads to visibly smoother scrolling in Chrome/Android.

Chrome also warns about this in the Dev Tools:

Here's a video showing the before and after (note some overall lag due to using Android screenrecord plus DevTools being attached; the "after" version is even smoother without those things): https://gfycat.com/DamagedDistinctHorsechestnutleafminer

[EtienneLem]

Thanks! 🤘