Input lag on Mac OS X builds

Question

Hi everyone,

I'm on 2019.2.19f1. Just before I go digging any further down the rabbit hole I'll describe my situation - I have a very simple 2d side scroller that I'm building for release at the moment, and I've noticed that the mac os x native app build has much worse performance (on the same machine) than the web gl build running in a browser. My eyes are picking up maybe 20-50 ms of input lag, or perhaps the frame rate is low enough that clicks are taking some time to be rendered to the screen.

Another thing to mention - the performance is completely fine in the editor. It only becomes noticeably worse after building a standalone app.

Is this expected, or should I try to continue to diagnose the problem?

EDIT: I've confirmed with a couple of demo projects on different versions that this is a regression in 2019.x and doesn't occur in 2018 LTS. I've filed a bug report. It's a bit frustrating that the issue was marked as fixed here: https://issuetracker.unity3d.com/issues/increased-input-lag-slash-delay-in-standalone-build-when-having-low-frames-per-second-or-vsync-enabled

EDIT 2: This is still not fixed a year later in 2020.3.15f2 so potentially the person who replied saying it was fixed just lied and didn't test it, or it's regressed again.

Answer 1

Answer by samanabo · Dec 04, 2020 at 01:01 AM

as far as I can see this is still an issue... I'm using 2019.4.14f1

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Answer 2

Answer by nicbarkeragain · Dec 04, 2020 at 03:41 AM

I opened a bug on the Unity bug tracker and received this response:

Hi,

Thanks again for reporting this issue. It's now fixed in Unity 2020.1.0a24 and above.

I hope this solves your problem, please reach out to me if I can be of further help.

Thanks, Mantas Customer QA Team

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Input lag on Mac OS X builds

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