Hi,
As the farm selector colours/hiring is related to the new release, you'd be better off posting the issue in the news and announcements thread where the devs will see it. There's a few that have the same problem, I'm not having the problem myself.
Slowness issues try the suggestions in the following threads......
http://www.slashkey.com/forum/showthread.php?t=393882
http://www.slashkey.com/forum/showthread.php?t=504374