UE4 really slow when using bsp

Joost

I've started making a blockout with bsp in UE4, but whenever I move a piece of bsp it takes like 10 seconds to calculate it. I can move static meshes instantly and I get good fsp in the viewport. Very frustrating...

WarrenM

How much BSP are you using? UE4 rebuilds the BSP tree after you move a brush or change a brush in any way ...

If you have a lot, it could be costly.

Joost

I've kind of fixed it. I had a large landscape in the level before and after I deleted it, it significantly sped things up. It still takes up to 10 seconds when I undo actions though. I have 35 brushes atm.