Try installing another game to see if it still happens or reinstalling Tarkov. Might try to clear shader cache first to see if that helps and check validity of game files (function in Steam and Epic atleast).
I had weird performance issue with Cyberpunk 2077 yesterday. Turns out, something was wrong with an overlay and game was a stuttery mess. Restarted computer, tried overlay with hot keys before starting game and it ran well.
If you have software like rivatuner or afterburner, I would disable or unistall them. XBox service has its own even if you don't use it. Radeon software has one. Geforce Experience had one. Then some other software have them too, maybe discord?