Tue Jul 26, 2016 7:38 pm
The question about coming from which OS is pretty important. For instance, if you came from a 32bit version, without a clean install, there will be a number of old drivers to update. You could easily run into problems with that.
Upgrading often is also a good time to do some housecleaning anyway. And a few runs with something like CCleaner (to remove old registry entries) and some restarts, updating of drivers and repeated cleans can solve a number of problems.
If you did that weird online Win7/8 to Win10 "hot" upgrade, that's also a bit of a roll of the dice. It worked for me... kind of... but it was never completely stable. So when I built a new system, I started fresh.
There are so many reasons for poor performance after a major change, it's really difficult to point someone in a specific direction, but one place to start would be "How is everything else running after the upgrade?" If other programmes are running poorly, you can start to look into main system drivers, peripheral drivers, that kind of thing. The list, unfortunately, goes on and on.