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Fixed in 2022.2.X

Duplicate in 2020.3.X

Votes

27

Found in

Issue ID

1383448

Regression

No

[Apple silicon][M1] Game view FPS is very low when the view is moved to an external display

Metal

-

Using an external display on an Apple silicon MacBook Pro laptop causes playmode FPS to drop significantly.

Repro:
1) Connect an external display to an Apple silicon-based MacBook Pro
2) Create an empty project. Make sure the scene view is not visible but the game view is. There's another, separate perf issue when showing both at the same time.
3) Enable the "Stats" button in the game view.
4) Enter play mode.
5) Move the game view between the built-in display and the external display. Leave it for a few seconds each time to let FPS stabilize. Note the values.

Result: Performance on the external display is very poor compared to the internal display
Expected: Much better performance on external displays

Comments (21)

  1. unity_skPGxJ5XjTl8yw

    Jun 21, 2022 18:54

    why is there no plan for 2021.3.x?

  2. unity_skPGxJ5XjTl8yw

    Jun 21, 2022 18:54

    @MITCHMUNRO

    it looks like this is only available with 2022.2.0a17: https://unity3d.com/de/unity/alpha/2022.2.0a17

  3. mitchmunro

    Jun 08, 2022 08:47

    Tested in 2022.2.0a13 Alpha. Issue is much better - but still a little inconsistent. Hopefully they iron it out before the release of the 2022 next stable version.

    When I have the editor on one screen and the game running on another screen, the frame rate gets divided by 5 (still usable ~1000fps to ~200fps), but drops as low as 70fps.

    You may expect a little frame loss from running the game on another screen, but a frame rate drop of 80%? That seems a little off.

  4. unity_skPGxJ5XjTl8yw

    Jun 01, 2022 10:43

    PLEASE BRING THIS UPDATE

  5. upendedturtle

    May 02, 2022 09:45

    Having this issue as well
    - unity 2021.3.0f1
    - macbook pro 14", m1 pro 16 core GPU, 16 GB memory, Monterey 12.0.1
    - Xiaomi Ultrawide

    on a simple scene,
    built in monitor: ~300-500fps
    external monitor: ~20-50 fps

  6. alanvitek

    Apr 21, 2022 04:59

    Can confirm having the same issue here. OCCASIONALLY I can get it to behave as expected (closing/restarting) but most of the time is capped to 30 FPS when using external monitor with laptop closed. When using just the laptop - 200-400 fps

  7. mitchmunro

    Mar 31, 2022 04:35

    Is there any new news on this? I cannot make games on any native version of Unity - too frustrating and fully of weird frame rate bugs.

  8. toyhunter

    Mar 20, 2022 00:54

    Same here. Intel version 2020.x doesn't have this issue though.

  9. unity_skPGxJ5XjTl8yw

    Mar 18, 2022 22:00

    Same here, unity 2021.2.16; 32 GPU cores and 64GB Ram

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