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.

 

FIXED!! Thank you so much for this.

 

Glad you guys worked it out, but i just have to make a comment: 2018.4.5... really?, lol. 2019 LTS is one of the best versions of Unity, and 2021 LTS is good, but wouldnt use any version higher just yet, but 2018?...

 

Maybe look at the dates on some of these posts.

 

Gets me every time, lol *facepalm*