Question (noob) where's all my memory?

M Nags

Distinguished
Dec 5, 2013
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18,510
Hi I'm useless at this stuff and admittedly looking to leach on some knowledge but I can't for the life of me figure out what's wrong with my memory after playing a few games. I have 16GB ram and a quick google search said Windows shouldn't use nearly as much as I'm missing. For the record I'd been on Firefox and the games Diablo 4 and Baldurs Gate 3 exclusively and after some time the computer just gets dumb slow, to the point where even task manager is having trouble. ANY help appreciated. A restart fixes it but I'd like to know what's going on.

Here are some screenshots of my limited diagnostics

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M Nags

Distinguished
Dec 5, 2013
19
0
18,510
Balls sorry, been a while.

CPU: AMD Ryzen 9 5900X
CPU cooler: Noctua NH-D15
GPU: Nvidia GTX 1660 Super
Motherboard: Gigabyte B550 Aoruc PRO AC
Memory: G.Skill Ripjaws V 16GB (2x 8GB) DDR4 3200MHz
PSU: Antec TruePower Classic 650W Power Supply