Bug Animation Preview very laggy and stutters when inside an addressable group

Steps to reproduce:

1. In my case I have a folder marked as addressable.
2. Inside the folder is only animations (or FBX files containing animation clips as well)
3. Click on an FBX to preview the animation, the preview window in unity shows the animation clip itself is not marked addressable, but does show that it's a subasset under the folder with a greyed out addressable path.
4. Click the "Play" button in the preview window to watch the animation

Result: Animation playback is extremely laggy and choppy. Even the Editor profiler slows to a crawl, like maybe 2 fps.

5. Now pause the animation preview
6. Click the Addressable checkbox to make that FBX/animation into an addressable asset
7. Click "Play" button again in preview window​

Result: Animation playback is smooth as butter. Editor profiler showing 60fps.

Expected Result: Animation playback should always be smooth no matter if item is addressable or not.

While profiling I noticed that when Addressables is OFF on the item, there's a LOT of garbage collection happening. roughly 5.5MBs per frame. Turning ON the item, all of that GC is gone.


This is the only other reference I could find to this issue: https://issuetracker.unity3d.com/is...n-using-a-lot-of-keyframes-to-edit-animations

@MrCool92 posts a way to fix it. Here's his summary of this issue:

"For anyone that uses addressables - we managed to fix this for us.

When using preview window an inspector header is redrawn and addressable entry deep check is performed. This causes GC."​

He has some other code I won't post here. But essentially he caches a HashSet of tried paths to ensure it's not checking every frame.

 

Did you try the latest version (1.19.17)? Looks like they fixed it. I don't get any lag anymore.

 

That's great! I should've mentioned this originally, we're still on Unity 2019.3.10f1. Which I think Addressables 1.19+ requires 2019.4+. We're hoping to upgrade soon so maybe this will fix it.

Thanks!