FEngineLoop::Tick or FViewport_Draw seems to be causing 450 ms lag spikes every 20 seconds or so.

FEngineLoop::Tick or FViewport_Draw seems to be causing 450 ms lag spikes every 20 seconds or so

Thats what unreal insights seems to say… I am new to profiling so this gives me a headache. No idea whats causing this or how to find out whats cuasing it. It happens regardless of how many objects are on the screen… i could be floating around looking at the sky alone and it will have these large lag spikes in this level. Though i only notice it in this level. Simple levels dont seem to have this issue…

It seems like having a bunch of unbuilt or “dirty” HLODs will cause this problem… moment i removed my hlod levels with copies that dont use hlod… the lag spikes went away… Anyone care to explain why?