Question Ever since June/July of this year every single modern game I try to run on my machine becomes unplayable after a short time

[JohnnyFright]

Ok so, M. Bison is added to SF6 so I decided to buy the season pass, when I went into actual match every single time someone did a super or 10+ minutes passed the game turned into a slideshow and I was forced to Alt F4 out of it while my machine was severaly slowed down still for a few minutes afte that. I was having this issues earlier in the month too but it would happen after an session lasting 1 hour or more. I wasn't a problem with such a game and I had this issue last year too due to the intense heat of that period. I tried to look into fixing this issue for a while to no avail and I gave up. Later on I tried Vladik Brutal (https://store.steampowered.com/app/1316680/VLADiK_BRUTAL/), Space Marine 2 and now Visions of Mana (https://store.steampowered.com/app/2490990/Visions_of_Mana/) and I run in the same crippling issue, I only have this issue with modern 3d games after 20-40 minutes.

My machine:
Lenovo Ideapad Gaming
Windows 10 64bit
AMD Ryzen 7 48000H with Radeon Graphics
RAM 16GB
NVIDIA GeForce GTX 1650 Ti - VRAM 4GB
AMD Radeon Graphics
SSD 500GB
HDD 1TB

I have tried many different things to no avail, I don't know if it's CPU throttling or running out of RAM since it's always around 83%-93% when playing a game. I've tried several things, tried old Nvidia drivers, Clean install of Nvidia drives, clean install of CPU drivers, CPU and RAM stress test gave no issues and i don't recall many negative signs with the usual programs to monitor this things but it could just be ignorance on my end, I also notice that Windows Defender's process is hogging a good amount of ram at all time but I didn't manage to get rid of it in any way, my CPU temps are around 89-90C when i play but they've always been like this and I never had much issues.

I'm at a loss as to what I can do about this, the only concrete thing I can think of is to clean my laptop again and repaste the CPU but I'm scared of doing that also because of how my laptop is assembled.

 

[JohnnyFright]

I'll look into trying one after some cleaning and maybe putting termal paste again, since both are due anyway.

 

[JohnnyFright]

I've ran another test after rebooting my pc and keeping discord and Chrome open while also constantly alt-tabbing and in about almost half an hour the game's performacens didn't tank, the phenomenon where after certain amount time ram usage decreased by 10% and more happened again despite discord and chrome in the background. This something I had noticed with all the other games I mentioned earlier, with some exception this issue seems to happen far more frequently after extended usage of my machine and rebooting it makes a whole lot fo things ran smother again. Worth saying that an issue I've always had with my machine where with anything wasn't a nes or snes game there were always moments where they stuttered for a few frames, happened rarely enough for me to not be concerned much about it.