PC performance help - Legion Help

So I wanted to try wander for the first time in like 5 years of playing... And this is on my screen pretty much always.. When there is more mobs, game is just laggig af...

But when i play slams etc. like normal build where is no 1000 projectiles on screen, game is stable 100plus FPS.

My spec :

GPU : MSI GeForce RTX 3080 Ti 12G
CPU : AMD Ryzen 9 5950X
RAM: Kingston DDR4 3600, 128GB
Motherboard: Asus Rog Crosshair VIII
2x SSD 1TB, 500GB