I have not seen any of the issues with Safari or Chrome that you are reporting. The opposite, in fact: Safari this is so much faster than Chrome under Yosemite

I have not seen any of the issues with Safari or Chrome that you are reporting. The opposite, in fact: Safari this is so much faster than Chrome under Yosemite that it has become my primary browser. I'm a developer, by the way, and have both browsers open most of every working day. If anything, I have seen an increase in quality with Yosemite.