Here's the problem. When I launch FCPX I get the splash and then it hangs for about 25 seconds with no activity at all. Then it proceeds and works normally. This is with the OS X Yosemite 10.10 (Official Release). I had the same problem when working under Mavericks too, but I was able to resolve the issue by following this guide. http://osxdaily.com/2013/11/24/slow-...blem-mac-os-x/ https://discussions.apple.com/thread/5495797?start=30&tstart=0 Since upgrading to Yosemite the workaround doesn't solve the issue anymore. Does anyone else have this problem and/or a fix? EDIT: Fixed NOTE: If you have WiFi turned on, you should perform this procedure there too. Man! FCPX opening is instant now!