So i bought a new computer and fps in tf2 is very low sometimes. Yes, sometimes it's completely fine, sometimes it's not. For example, on tr_rocket_shootting usually i have around 600-800 fps. Right now, when i join this map, fps is still around 600, but after 5 mins it's reducing to 200-300 fps, after another 5 mins to 200 and then to 110-140. On other maps the problem is the same. The strange part is that sometimes it's fine, fps is stable, like 600-800 on local training maps and a bit less on 6x6 maps. Why is it happening, i have no idea. Yesterday i played some 6x6 games and everything was ok, today it's reducing to 100-180. In other games everything is fine. I tried Doom, Apex on max settings and fps was fine, completely fine. Even in games like HL2/HL2 Deathmatch everything is perfect.

In tf2 i use master confing, but some old version of it. I tried to remove it and tried new versions of it. Every time it was the same, fps is fine on start and after 10 mins it's very low.

Specs are:
ryzen 3600x
gtx 2060 super
tuff x470 plus mother board
16gb 3200 memory
ssd 500 gb

Tried everything, new versions of cfg, no cfg at all, changing settings in nvidia driver. It's still reducing. I just wonder why is this happening and why it was fine before.