Massive in-editor slowness following update to 2020.3.19f1

Unity Engine
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Hi,

I am developing a game on an iMac 2017 27" (Intel processor) and the game uses URP.

The game was working perfectly well (high FPS) in game mode on 2020.3.16f1 but since updating to 2020.3.19f1 it is very slow once I enter game mode in the editor (although the speed is fine when I build the game).

I tried on another game (much lighter) that I was working on a few months ago and I see the same slowness.

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I also just tried to move the project to 2021.1.22f1 but I’m getting the same effect when I enter game mode: not only is the game itself running slowly but it slows down the entire computer.

As mentioned above, game mode runs fine on 2020.3.16f1

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I have the same issue. iMac Pro 2017. Upgraded to Unity 2020.3.19f1 and I get huge Game View stutters ever couple of seconds — although it seemed fine in a build. I downgraded to 2020.3.18f1 and it was fine again.

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Would it be possible to get a hot fix for this - like a 2020.3.19f2 version?

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Could you specify whether the game view stutters you were experiencing were on a URP game or a game using some other pipeline? That would be quite useful.

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I am experiencing terrible lag/stutter since I updated from 2020.3.18f1 to 2020.3.19f1. I am running MacOS 11.6 on a 2018 Mac mini with a Radeon RX 580 eGPU. I don’t use any scriptable rendering pipeline, just the standard built-in one.

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Alright, thank you for this. So to sum up:

  • the problem was introduced in the 2020.3.19f1 version
  • it seems to only affect Mac users
  • it’s not only related to URP, built-in projects seem to also cause massive slowness

Since this is not a bug we can’t really submit a bug report can we?

Can someone from Unity get back to us here?

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We had some other discussion here: Massive jitters when entering game mode for Mac users from 2020.3.19f1 - Unity Engine - Unity Discussions

This is absolutely a bug and filling a bug report is the quickest way to inform us about any issues with Unity. Chances of us noticing issues on the forum without associated bug reports is pretty low, unfortunately.

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