Performance degradation in Builds when setting QualitySettings.vSyncCount to 2

Unity: Metal

macOS

Won't Fix

6.3.X

6.2.X

6.1.X

6.0.X

2023.3.X

2023.2.X

2023.1.X

2022.3.X

2022.2.X

2021.3.X

2020.3.X

Cancelling this 2023.2 tech release issue since the support for this release has come to end of life. Cancelling this 2023.2 port case does not affect any LTS or Unity 6 Beta/Preview that remain open.

How to reproduce:
1. Open the user-attached “FPS Fail.zip” project
2. Build and Run the user project with the “Sample Scene” added (File → Build Settings)
3. In the Player select the “QualitySettings.vSyncCount: X” button to change its vSyncCount to 2

Expected result: Stable performance regardless of vSyncCount and no jittering
Actual result: Performance is unstable ~55-59FPS and jittering is slightly visible

Reproducible with: 2020.3.48f1, 2021.3.25f1, 2022.2.20f1, 2023.1.0b17, 2023.2.0a15

Reproducible on: macOS M1 Max Ventura 13.2.1 (Silicon), macOS Ventura 13.1 (Intel)
Not reproducible on: Windows 11

Notes:

On Intel macOS it appears that the FPS is even worse ~30-33FPS
User stated that the issue only happens with ProMotion, but changing it to a different refresh rate still reproduces the issue
Not reproducible in the Editor

Performance degradation in Builds when setting QualitySettings.vSyncCount to 2

Unity: Metal

Won't Fix

Prioritise and Follow this issue

Have a workaround or additional info about this issue?

Performance degradation in Builds when setting QualitySettings.vSyncCount to 2

Unity: Metal

Statuses

Won't Fix

Resolution Notes

2023.2.XWon't FixCancelling this 2023.2 tech release issue since the support for this release has come to end of life. Cancelling this 2023.2 port case does not affect any LTS or Unity 6 Beta/Preview that remain open.

Description

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