Multithreading problem on xeon cpu

Details on problems you're experiencing, and if it's occurring when certain skills are being used.
Unstable fps when multithreading is enabled. Fps constantly changes from 5 to 140. Tried changing all kinds of settings and renderers. The problem disappears when multithreading is disabled and fps is set to around 45.

Computer specs: CPU Xeon E5 2640,2667v2, GPU RTX 3050 8g, RAM DDR3 16g.


Game Settings: Renderer, Triple Buffering, Multithreading, etc. And if changing any of these helps.
Tried changing all kinds of settings and renderers. The problem disappears when multithreading is disabled and fps is set to around 45.The graphs show how they straighten out after disabling multithreading and the game stabilizes.

Videos or screenshots of your client when it's happening, with performance graphs on (F1 in-game).

multithread on
https://fastpic.org/view/124/2024/1130/_91bdc13498e990ca34976d4630a9abc2.jpg.html

multithread off
https://fastpic.org/view/124/2024/1130/_c8234def2d45ab349264f60860797d8a.jpg.html