When gaming, CPU frequency/speed goes full tilt than 0.5GHz then back up and keeps looping

Games are Marvel Rivals and Paladins.

Since about 1 week ago, my computer works perfectly well except when one of those two games is runing, as soon as the game is running, the cpu speed goes down to ~0.5GHz, then back up at ~2.6GHz, then back down again,

here's a picture for proof (using process lasso) :

https://imgur.com/a/gZUUfto

It renders the entire computer unusable and stops happening at the exact second I close either of the games.

It's not temperature related, I've reinstalled GPU drivers fully, I've reinstalled both games fully.

The one thing I could try and haven't done yet is a full windows reinstall, but I'm iffy about trying that so I'll wait for better options, if you have any.

Specs :

11th Gen Intel(R) Core(TM) i5-11400H @ 2.70GHz
16 GB of ram
NVME disk
NVIDIA GeForce RTX 3050 Laptop GPU