PC just casually lagging

https://reddit.com/link/1tvn14d/video/tfpdxin4325h1/player

I am playing MM2 or a modded version of it, and when i lag this much the murderer or sheriff just gets a free kill (you can clearly see the lag in this video), does someone know how to fix these lag spikes? (i even tried the microsoft store version and it still did it