Probably most notably the iOS photos app until like 2014.

Edit: just checked. iOS 11 in 2017 added gif support to photos

I’ll also add, safari supported animated gifs for a long time before that and you could still save them in safari like any other image. But photos would only show the first frame like you said. When 11 came out they played like normal.

In college I had an aluminum body laptop that mostly sat in its dock. I cut a sheet of thermal gap fill to the size of two heatsinks and put one over the cpu and one over the gpu. It shaved off a few degrees