I am having the same problem with CC 2015 & Windows 7 64-bit. After launching Photoshop and just hovering my mouse above the tools icons or the top dropdown menu, Photoshop just freezes and reacts with a huge (5-10 seconds) lag to any action that I do. After about a minute it starts working as it should - altought I think it still takes more time when switching between two documents than it did in CS6 where it was instant. I have tried resetting my preferences, disabling HW acceleration, checked that I have the latest drivers for my video card but none of this helped. It doesn't matter whether I use only mouse or Wacom tablet, happends on both.
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