At x3 speed it happens every ~3 seconds so it seems to be linear. The delay between the stuttering is always the same and seems to be affected by game speed. My problem is that my game seems to stutter for half a second every ~9 seconds. Everything is working fine(ish) and there are almost no errors on startup so I decided to give it a go.
I'm about to start a new Rimworld playthrough and after spending alot of time searching for and filtering out mods I came up with quite the modlist.