I use Firefox, and Google's sites are literally the only ones where I consistently have issues. There was a period of about a month this summer where Google Maps was just completely broken for me, the map wouldn't update at all when attempting to search or pan. There was recently a several day span where chat in Gmail had a 10+ second input lag due to some font-related JavaScript code spinning the CPU nonstop. It's l…
There's 100% targeted de-optimization for firefox users and the burden of finding it is on the users it seems.