FPS Issues after one or two matches

Some time ago I’ve been having some fps issues, right after i boot the game i get around 60-114 fps depending on the map, but after playing some battles for some reason my fps drops to 25-15, it also happens sometimes when there are too many destroyed tanks in one place

my PC Specs:
I5 2500
16GB RAM DDR3
GT 1030 GDDR5
1TB SSD

also, I’m using old graphic cards option

Same Problem here.

When i restart the game the issue is gone most of the time.

Specs:
CPU: AMD Ryzen 5900X
GPU: Palit RTX 2080
RAM: G.Skill 3200 mhz 32 GB
Hard Drives: all SSD WT is on a NVME