Closing Wish List Results Tabs

Whenever I close a Wish List Results tab, it freezes the client for about five seconds, making it a chore to close them all, which is especially frustrating since I didn't notice the "new" tick box to hide certain users' results until this evening... Made closing them all very time-consuming and boring. Would be nice if they closed and client remained responsive instead of freezing. I'm on Win 7 Ultimate x64 using current Windows build.