Computer lags when switching between or after closing an application

[Katie Win]

Hello,I've noticed for the past couple of weeks that my computer will lag when I either try alt-tabbing or pressing the Windows key to switch to another application making it impossible to use the other applications. I've noticed it only really happens when I'm in a game and happens for every game I've tried, including games with very low requirements. If I can switch back to the game, I can wait 20 seconds and the lag goes away as long as I'm in that game but the lag will reappear if I try and switch out of the application again. If I close that game, the lag will still remain and I have to j

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