Tree manager is a BP I add to my world to control functions to do with interactions with my trees. Deleting it doesn’t help, I just recently added it to the map I was testing on so I could run an event at begin play to change the collision of some of the foliage components after the map had already loaded, but the foliage performance problem happens even on a completely clean new map. Recreated the problem in 4.27 and 5.4 as well with clean maps without tree manager or anything else.
The interesting thing is that at begin play and/or when the collision is enabled the first event is called “OnCreatePhysicsState” before the “CreateAllInstanceBodies” even though physics is disabled. Maybe its just a naming convention but seems strange it’s referencing physics even though its not enabled.
Also these two events don’t seem to take up an unreasonable amount of time themselves but they are followed immediately by a lengthy foreground task