I recently had my machine upgraded to Windows 10 and the perf profiler has been extremely slow ever since. Unusable when the app being profiled is really busy, the app being profiled would just hang or crash. This was never a problem with Win 7. I tried 9.3, 9.6 and 9.8, all behaved the same way. Another machine with everything else being the same except running Win 7 works just fine. Are you aware of any issues related to Win 10? I'm on version 10.0.16299.0.