Something about UpdateUILayouts (specifically: Text Shaping+Layout) taking extreme times when moving camera. This is one of the main reason for the lag (Especially on older servers). This is probably because of something to do with billboard UIs. I don’t see into the games code so I can not know for sure.
What were you doing before bug occurred: Move Camera
Steps to reproduce: Move Camera (Stronger effect on older servers)
F9 Logs ( press f9 to view them in-game): Doesn’t help
Pictures/Videos: