URC massively stalls generation/deletion of HLODs

Summary

When building/deleting HLODs, URC may cause up to 7 seconds of stalling per HLOD chunk. This translates to a massive amount of time that is being lost waiting for no reason. It also causes the deletion of HLODs to fail when the bar is complete.

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Unreal Revision Control

Steps to Reproduce

Have two large projects side by side on two different PC
One has URC enabled, other doesn’t.
Run on both HLOD building and deletion
Count time

Expected Result

Time should be the same for both

Observed Result

The one that has URC enabled may take 5-17 times more time compared to the one that doesnt

Platform(s)

PC