Read a post that Chrome/Safari was only getting 25fps and that was with a 15" Iris pro model.
Here's how anyone can check framerates... Be interested in results of the different models new and last gen...
http://apple.stackexchange.com/questions/56108/how-can-i-monitor-the-fps-in-osx
Here's how anyone can check framerates... Be interested in results of the different models new and last gen...
http://apple.stackexchange.com/questions/56108/how-can-i-monitor-the-fps-in-osx