Physics causing lag spikes

I'm getting some horrible lag spikes after upgrading a project to 2018.1.0b4. The Profiler says it's being caused by FixedUpdate.PhysicsFixedUpdate,and the main offenders appear to be PhysX.PxsAABBmanager.actorAABB and PhysX.ScScene.postIslandGen. It only happens with the FPS Controller and not a static camera. Anyone else have this issue? I know this has been an issue previously but as I've made no changes to the FPS Controller between 2017 and 2018 can only assume it's an upgrade issue?

 

I have the issue - have you filed a bug?

 

I submitted a bug-report a while ago with 2018.1.0b1:
(Case 983582) 2018.1: Physics.Processing performance issues

QA replied with:

Can't find it in the public Issue Tracker though.

 

Where would we be without you?

Spoiler

 

Hmm, this doesn't seem to make a difference for me. But glad someone's logged it.

 

Yeah I'm not sure why vsync would make a difference either but that's for Unity to figure out.

 

I'm having this issue with the simplest scene possible, just a cube with a rigidbody attached. It is true that the V Sync Count setting affects the spikes, however changing this setting does not fully solve the problem, if I set this to "Every Second V Blank" the spikes still occur, less often but there are still frames that require more than 35ms, changing this setting to "Every V Blank" reduces the frequency of the spikes even more, but they don't disappear completely and sometimes frames take more than 60ms to complete.

 

get this issue with vsync on, off, every second vblank, can't really do anything in Editor play mode (2018.1.0b11)

**EDIT** i made a PC Build, hitching is noticeable, not as severe as Editor, but not acceptable either

I noticed the issue for this is marked fixed in future release, maybe next version? https://issuetracker.unity3d.com/is...e-in-runtime-caused-by-physics-dot-processing

 

At least Android builds work fine for me, but in-editor testing is pretty much unbearable like this imo.

 

still having this issue in b12

 

Yes it seems like the build used internally just for ECS work. So here is hoping for next.

 

oh well okay then.

Could be worse.

Thanks for the quick reply!

 

Still have the problem here with Beta 12 released on March 23rd.

 

I think this beta was due to have it fixed but it's really just an ECS-compatible build. We might see it in 13 if all is well.

 

Any ETA on a fix? This is really hurting our project at the moment!

 

Confirmed, b13 has fixed the physics spike issue in my project.