Unapplied prefab change = super long load time.

Since this is not a super official bug report, I guess I'm mainly writing it for my future self. So that when I encounter this issue again. I could find this thread and remind myself how to fix it.

So recently I've noticed that main scene in my game took a huge time to load, enter playmode and exit play mode.

Here's so rough stats.

Enter Playmode 1:45 (should be around 00:30)
Exit playmode 1:30 (should be around 00:08)
Open scene in editor 1:30 (should be around 00:20)

I took me several hours to find the source of the issue and it turned out that the issue was caused by a probuilderized model of the house where I didn't apply changes to the house prefab. I soon as I applied those changes issue was gone.

Currently I'm using ProBuilder 3.0.9 But recently I did try to update to 4.0.3 and If I remember correctly even in 4.0.3 load times were huge.

I did try to reproduce the issue, but I wasn't able to.

 

I'm using Unity 2018.4.5 and ProBuilder 4.1.0 and the issue has returned. When I remove all probuilder objects from the scene it goes away.

Here's what editor profiler shows
https://i.gyazo.com/a4ae012bfa2e086031a7ef8ff5864a3e.png

I'm currently in a process of finding what specific gameobject causes this issue. But it will take a while.

 

Unfortunately it seems that this time it isn't related to one specific game object. The more probuilder object I removed, the faster enter/exit playmode time became. I'll try new version of probuilder and see how if it helps.

 

Remove all probuilder scripts in a scene solves this issue. But I'm not sure that this is an ideal solution.

 

I've reverted old version of this scene from svn and it doesn't have ridiculous load/enter/exit play mode times. I've tried to make same changes that I did before to trigger this issue, but this attempt wasn't successful. So I wasn't able to get to the bottom of this. My current plant is to use older version of this level and remove probuilder scripts from every object I can't become, even without those ridiculous loading times and difference is still big between scene where probuilder prefabs are present and scene where there are non. (17 sec vs 2-3 sec) to exit play mode for example.

update: Damn. looks like for prefabs I do need probuilder script. Good thing, there's export to asset option.

 

Oh man, you just saved me. I have created a small part of a prototype city with 39 buildings using same prefab.

The Play enter time before I read this topic was ~ 20 sec. Now it is 2 sec.

I have selected all prefabs in hierarchy and just clicked on Overrides -> Apply All.

Issue fixed.

Thank you so much for posting this!

 

I had to make this experience by myself and there was no clue whatsoever, which causes this long loading times. Until I found out that leaving ProBuilder Scripts on Prefabs was the cause. After I exported the ProBuilder created models as .obj and used them instead, the loading times were fixed.