I just started suffering this problem of Bridge CC being unresponsive a couple of days ago. A quick way to check for this symptom is to click on a file in the Content pane and then, holding down the Ctrl or Shift key, click on an adjacent file. The second file should be added to the selection immediately. If it takes 10 seconds or more, that's the unresponsiveness problem I'm talking about.
I followed the repair procedure posted by HappyGuy, but without any luck. Pursuing his same thinking, though, I was able to quickly fix the problem. I went to the Favorites panel in Bridge and removed every favorite that involved network access. I then clicked on each of the remaining favorites to make sure they were all working. I found one that pointed to a file that had moved, so I removed it. After these changes, Bridge started working at its normal pace again.
(I had recently added a couple of favorites for accessing folders over the LAN and I think I had also moved one file, breaking the corresponding favorite.)
I think from what has been said previously in this topic, before doing something simple like extending a selection or bringing up a context menu in response to a right click, Bridge is stopping to check a whole lot of things that don't need to be checked. You can call this a bug or you can call it poor software design, but apparently it has caused a lot of users a lot of grief. Causing users a lot of grief is bad for the reputation of your software product, so I think Adobe should address this problem by changing the software.