The BB was painfully slow. I went so far as to do several traces with timing and routing of the BB messages, but got nowhere. Not sure what ultimately resolved my issue..
Suggest you try resetting your browser to the default settings. If that doesn't help, try a different browser - if you're using Explorer, try Firefox or Chrome. If that improves things, then an uninstall/reinstall of your browser may get you where you want to be. You're not alone in experiencing this issue.
Good luck - the slow response is trying..