Editor slowdown after breaking boxes

I’m making a platformer similar to crash bandicoot. When testing levels, sometimes the game slows down to maybe 15 fps after breaking certain boxes (which removes the actors from the world). There doesn’t seem to be any particular rhyme or reason for which box causes this slowdown, but that box will cause the issue until I quit the editor and relaunch.

It’s not really an issue currently, but I am concerned that this might affect the game when it’s ready to build. Has anyone else had similar issues?