The question was already asked a bit differently in another thread, but the answer was not helpful.
https://answers.microsoft.com/en-us/windows/forum/all/task-manager-performance-memory-usage-higher-than/ffde0f28-e5f9-48a7-bd45-b36e7925c534
Why does the task manager not show the real usage of RAM of the processes? If you add up everything that is listed in task manager you get less than 50% of main memory usage that is reported on the other tab of the task manager!
This is very unsatisfying, because it means you cannot determine what is actually causing the high memory usage.
It doesn't seem to be Windows System processes alone, but a certain overhead for every program.
If I close a task, that is reported to use 920 MB of memory and compare the overall RAM usage before and after, it drops by 1.7 GB, which is nearly double of the closed process, although on the processes list, this is the only task that disappears.
I'm using Windows 11 version 10.0.22621 Build 22621 on a Lenovo Laptop with ADM Ryzen 7 Pro 4750U and 32 GB of DDR4-3200.
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