I learned about a new #CSS attribute that's pretty cool: will-change.
/* Warns the browser transform will be updated a fair amount */
It basically tells the browser "hey, this attribute's probably going to change on you, so you better be ready." I don't know exactly how it works- if it pre-processes most likely updates, passes processing to the GPU, etc- but it fixed some problems with moving elements smoothly on mobile for me.
MDN actually says it's "intended to be used as a last resort" which is always a good sign for a new web standard IMO. It's good to keep our devices on their toes.
I'm betting we'll see it being abused to heck if it hasn't been already. It may just become the new !important.