Closing the standby list actually can slow PC down, as the items are there for a reason and clearing them from ram just means if/when the CPU goes looking for them, it has to reopen them from storage. I seen that program before and it works against how win 10 memory management does things.
Win 10 compresses things into ram if you close them so if you decide to reopen them later, it decompresses them and its much faster to do that than look on storage. Win 10 can run in less ram than all previous versions of windows until you hit windows XP.
it shrinks/grows to use what you have. I don't know how much ram it uses if you have 64gb or more, it would be slightly bigger if only as it has to map the ram and that takes space. If you run rammap (https://docs.microsoft.com/en-us/sysinternals/downloads/rammap
) it also uses ram to map itself. the data has to be somewhere.
His problem doesn't seem to be ram usage and more CPU. What had focus when you took the CPU usage? game or browser? I will look at my usage later when I have Diablo 2 running on desktop though I doubt its usage is that heavy compared to other titles.
try doing a virus scan or run Malewarebytes.
What is CPU usage like at idle. Idle is when you aren't doing anything, PC is never not doing something. Not right after startup as its not idle then, but give it a few minutes to just sit and see what its like.
Mine is almost always at 3 to 5% usage on CPU, I have monitoring programs that mean its never not doing something. ram is 30% usage
3600xt, 6 cores/12 threads
Windows 11 Home
Nvidia RTX 2070 Super
Aorus X570 Elite Wifi