Extremely slow collision building in package build, but PIE is very fast? What could cause this?

Dev build for windows, ue5. I am spawning instances via HISM and noticed an absolutely massive performance difference between PIE and dev build. PIE is perfectly smooth no hitching at all while in dev build my game comes to a complete stop and freezes. Turns out this is because of the collision build when adding instances. I did a build with collision off and it’s perfectly smooth again, plus I can also see the massive collision cost in insights. It’s 100% the collision.

But why? Why would it take significantly longer in a packaged build? Is there some settings I am unaware of? I am happy to mode source if needed.

Hmm, I’m not sure exactly what your doing in terms of your setup. And this really isn’t an answer, but I’m hoping it sparks one. That being said I did have an issue before with an asteroid field that I ended up having to break into sections of HISM’s for performance reasons.

Before I had all the asteroids as one HISM and they ended up always rendering, even if just one of them was being rendered. Splitting them up into sections let ones far enough away to cull. I didn’t have your exact problem with collisions, but I did see a similar issue with performance from PIE to packaged builds.