Extrem lags when Fullscreen Game is in Background

Jan 6, 2019
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Hello all.
I have a weird problem .. when i play a Game in Fullscreen and Windows+D out of the Game or open up another Program (like Firefox or another Non-Fullscreen-Program) my Windows lags so hard, i barely can move my mouse, and in Teamspeak/Discord i have no chance to understand anything because the sound is so distorted. It feels like my computer dies.

My Spec:
Intel 9900k
Samsung 970 Evo 2TB
32 GB RAM
GTX 1060 6GB
Windows 10 Pro 64 bit latest (fresh install)
all standard settings, except XMP-Profile in BIOS

I have no clue whats happening, neither RAM, SSD nor CPU is 100% busy.
Windowed or Borderless Window -> everything runs smooth.
 

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