Thread:VisualEditor/Feedback/VisualEditor taking up too much CPU usage and very slow/reply (4)

Thanks for the link. That one works okay for me in Safari on a Mac, so there's probably nothing wrong with the page itself. Do you get the same behavior if you quit and restart, and clear the cache in your web browser?

I think that User:Catrope will be interested in this, since he did much of the work on VisualEditor for Internet Explorer.