2021.1.22 + 2020.3.19 huge performance issues affecting mac

Hi there,

Just letting the team know we're seeing massive performance issues in v2021.1.22, we upgraded only from 2021.1.18 and it seems like the GPU is super choppy. If we check an FPS read out it seems like everything is fine, but it's clearly not so we're assuming it's a GPU issue.

We tested this out by zero changes to our project, cleared the library, opened it back up in 2021.1.18, no performance issues. Open it back up with 2021.1.22 and it's is super choppy, barely able to render even in the editor without hitting play. It's too hard for us to submit a bug report, some details:
- running on macOS 11.4 and 11.5.2, multiple machines behave consistently and point the finger at 2021.1.22
- we're using URP and Shader Graph for all of our shaders

Let me know if you need any other info, but it doesn't seem very hard to replicate. Performance is so bad.

Thanks,

Jason

 

We can't see any errors in the console and nothing obvious to point the finger at.

 

I've updated to 2021.123, but it's the same and the editor is slow.

 

Same here. Works great in 2021.1.21f1 but both .22f1 and and .23f1 are super choppy.
Also MacOS, but 11.6 in my case. Built-in render pipeline. 2018 MacBook x86.

 

I believe you guys are having the same issue as me. It seems to come from something that was introduced from those versions:
- 2021.1.22f1
- 2020.3.19f1

I'm currently downloading 2021.2.0b14 as the below issue tracker seems to imply that it got fixed in that version. I'll update you here.

https://issuetracker.unity3d.com/is...-when-changing-gameobject-transforms-position

If you could upvote the issue that might speed up Unity's response.

 

Thank you for posting this. I'm seeing this as well and it had me worried.

 

2021.2.0b14 seems to be alright FYI. I'm waiting for the fix to be implemented 2020.3.X as most of my assets are not compatible with the TECH stream just yet.

Don't forget to VOTE on the issue tracker if you can guys.

 

I'm having the same issue. Have tried on both my 2017 MBP and my M1 Mac mini.
Tested both 2021.1.23f1 and 2021.2.0b14, same issue in both.

For me it's so bad that Unity is basically unusable.

 

Same here

If you check the below link, you can see that today they've finalized the bug fix for 2022.1 but they're still at the same stage for 2020.3 (LTS) unfortunately:

https://issuetracker.unity3d.com/is...-when-changing-gameobject-transforms-position

Can anyone at Unity give us an update on this?

 

Just out of curiosity: how long does it take on average from code review stage to actual delivery? I've just upgraded from 2019.4.30f1 to 2020.3.19f1 on my Mac OS (Big Sur) and it's really difficult to iterate and test stuff when the performance is so bad in the editor Play Mode...

 

Thanks for the update: can't this simply be pushed individually as a hot fix (2020.3.19f2) instead of as being pushed as part of the 2020.3.20f1 release?

 

Could this be related? https://forum.unity.com/threads/macos-not-using-discrete-gpu-no-matter-why-i-do.1133725/

 

Thanks. Any chance you could look into it anyways? I found a way to reproduce the issue and file a bug here (case 1371020)

 

Wow, this is still not fixed in 2021.1.24. Is everyone using the Mac version experiencing this huge pause every second when running or is it just happening on certain machines?

 

I've been experiencing the same issue. FPS in Stats says I should get 30-60 FPS, but what I see in the editor window, both in edit and in play mode, looks more like 2-10 FPS. It's unusable.

This is a 27" iMac, using 2021.2b14 though I've had the issue with the latest 2021.1 as well.

 

Hi @Tautvydas-Zilys - is the 2020.3.20f1 coming in later today by any chance?

 

I've just installed it through the Hub, but the error persists. Anyway, I guess this is expected as the fix is still in review for 2020.3.X. Guess we'll have to wait a bit longer...

 

I understand your frustration as I'm also experiencing this problem, but to be fair, the workaround suggested by @Tautvydas-Zilys of moving back to 2020.3.17 works and is acceptable for probably most users while the fix comes. I also understand that the management of such a giant software like Unity and the prioritization of tasks and bugs to solve must be really tough.

 

The problem appears to be solved or at least massively reduced in 2021.2b15

 

I've just installed 2020.3.20f1 and still getting massive lag and stuttering in the editor. It also happens on 2020.3.19f1.

Version 2020.3.18f1 and previous do not have this issue.

 

Hi and thanks. Just to let you know, the issue still appears in 2020.3.20. Any chance one of your colleagues looks at the linked thread (https://forum.unity.com/threads/macos-not-using-discrete-gpu-no-matter-why-i-do.1133725/), because the issue has quite a big impact on working on a Mac. Plus it seems some parts of my bug report were lost, or at least they do not appear in the bug description (Bug 1371020). How do I add this infos now (how to reproduce, platform etc.)?

 

Same issue here on 2020.3.20 , updated from 2020.3.18 and all was fine before upgrading.
Mac 11.4

 

Great! Will be 2020.3.21 soon available?

 

@Tautvydas-Zilys how do issues qualify to be listed in the release notes as a known issue? I would have expected a bug like this to be listed given how badly it affects editor performance (particularly in 2020.3 LTS).

 

Snap... I wondered this exact thing this morning when looking at the release notes checking for a resolution.

I wish we could subscribe to issue trackers to be alerted when they were fixed, or at least an alert from fogbugz if we're the ones who have reported a bug to let us know when they've hit a production version. Often the language used to describe a fix in the release notes doesn't correlate to bug reports submitted and I find myself having to read through these long lists of issues soooo often, trawling to see if a fix has landed, and trying to decipher what the fixes mean to see if they're by some chance related to the fix I'm actually interested in. Wouldn't it be great if we could just be pinged when they're fixed, or even get updates on an ETA for a fix like 'issue 123 is planned for Unity v2027.2.45', it might just cut down the forum activity by 80% pretty much this over and over "when is the fix arriving??"

In the meantime, super appreciative of the updates you always put up @Tautvydas-Zilys thanks!! I just wish there was a formal way all of this info could be surfaced and easily tracked.

 

Hmm, better check some pull requests and feed us a round of scapegoats...

Thanks for keeping everyone up to date - much appreciated. As @jason_yak suggested, being able to watch bug reports would be handy, or a more useful public issue tracker would be great too (public facing descriptions/repro steps, watchable, spam removed from comments etc).

 

This is pretty unbearable. My simple projects are totally unworkable on my macbook. Is the problem clearly the Unity versions or is it the OS? I've had other S***ty performance issues on Big Sur.
This related? https://developer.apple.com/forums/thread/666661?page=19

I was hoping Mac OS Monterey would smooth out things... ;-)

 

Can this be fixed now please?

 

I'm using 2021.1.25 and it seems to still be happening.

 

great!

 

Amazing! Frame rates are back to normal ;-) I don't need to buy a new computer now.

 

Just installed 2021.1.26 on M1 MacBook Air + external monitor, framerate is great and performance is smooth, EXCEPT the game view occasionally blinks gray (I have dark mode on), and the scene view blinks gray pretty frequently, making it difficult to use.

I'll test 2020.3.21 when it's released.

2 steps forward, 1 step back, huh?

MORE INFO: the flickering seems to be relayed to my cursor scrolling over UI elements of the Editor.

 

Hi. Thanks for the Update. I upgraded to 2021.1.26. While Editor performance is noticeably better, Editor still uses integrated graphics rather than GPU on MacOS Big Sur, even when GPU is specifically selected in "Preferences/Device To Use". I check the status which GPU is used with the tool "gfxCardStatus", which reliably tells me when the Mac switches to the GPU and back.

Could it be that the issue discussed here / fixed with 2021.1.26 is not directly related to the issue I described (https://forum.unity.com/threads/macos-not-using-discrete-gpu-no-matter-why-i-do.1133725/) and therefore only partially fixed? If so, could please someone of your QA members look into the thread I just linked, because no one replied although I postet this 3 weeks ago and its a major issue.

 

The same thing happens on my projects as well. M1 MacBook Air, trying with a few different projects, including brand new, and all packages updated results in the same thing: amazing editor performance again, but flickering so awful I'm staying on 2021.1.17 for the time being. I did file a bug report a few versions ago and included a video of what I was doing. Hopefully it helps!

 

Same thing happens to me (Mac mini M1, empty project with a single cube in the scene view). 2021.1.26f1 solves performance issue but scene view flickers so bad that it's unusable (sometimes the scen view even goes blank and I have to reselect the cube to get the scene back).

 

I created a new URP project (A) and was not seeing the flickering issue, that is when I realized that the upgraded project was Classic RP, so I created a new project with Classic RP (B), and it IS flickering. Then I converted my testing project to URP, but the flickering continued, same with adding URP to project B. Lastly, I remove URP from project A that was not flickering, and the flickering has not resumed.

 

Huzzah! It looks like the flickering is when color space is set to Gamma, as switching to linear made it go away. I think the RP difference was just that a new URP project started in Linear color space.

 

This worked for me!