What makes Blueprint compile times longer?

Disabling compilation manager gave me good results regarding compilation time, but there’s one caveat I found: after restarting the engine, there’s a chance for it to crash if I play the game (in editor) before recompiling the blueprints I’ve modified after disabling the compilation manager.

Not sure why or how–it simply happens.

I’d love any advice on this because having BPs taking up to 20 seconds to recompile thanks to the compilation manager is driving me insane.