Drawdown FPS in games on Windows 10

Faced with this issue in Windows 10 was updated with Windows 7, no problems with updates, everything was installed and worked, but the games just awful, dropped FPS by about 15-20, and in the main menu of almost all games, the time delay between switching of tabs, turned on the FPS counter and noticed sagging fps to 1-10 when flipping tabs. I thought crooked was updated, reinstalled with the image, nothing has changed, reset all the available firewood, does not work, reset again, only using UEFI mode (I had read that in this mode, Windows runs faster), with no changes.
Installed back Windows 7 and everything was corrected.
In General, help to deal with the problem, Windows is very pleasant, always write about the performance, mine is the opposite.