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Fixed in 2020.1

Fixed in 2018.4, 2019.3

Votes

41

Found in

2018.4

2019.2.0a1

2019.2.1f1

2019.3.0a1

2020.1.0a1

Issue ID

1178300

Regression

Yes

Semaphore.WaitForSignal under Canvas.BuildBatch causes a slow editor in Play mode

Shuriken

-

Steps to reproduce:
1. Open the attached project "Temp Project" from the ownCloud link
2. Open "Main Scene"
3. Turn on the Profiler window
4. Enter Play mode
5. Notice the Spikes from Semaphore.WaitForSignal

Expected results: Semaphore.WaitForSignal does not cause spikes in the Profiler window and making Editor slow
Actual results: Semaphore.WaitForSignal causes spikes in the Profiler window and makes Editor slow

Reproducible with: 2019.2.3f1, 2019.3.0b1, 2020.1.0a1

Note: 2019.1 breaks the project and its packages

  1. Response avatar

    richardkettlewell

    Oct 16, 2019

    We are working on a fix for this.

Comments (35)

  1. A02bab46a3e0343aa9983afa5c4da67f?d=mm

    Ilturco

    Mar 05, 2020 22:57

    I've the same problem in the 2019.2.16.f1 but I "solved" .In my case, I see this fps was down exceptionally when the camera point in the direction of "DontDestroyOnLoad". I took all my scene objects and positioned in y: -1000. Now the DontDestroyOnLoad spawn in top of my scene and the problem are vanished.

  2. Ffa645a20d8114f8371a3f888434ae13?d=mm

    BigRookGames

    Feb 12, 2020 00:56

    experiencing this on 2019.3.0f6

  3. E2893644c7643e03543dc328b381ee9a?d=mm

    Anil5554u

    Feb 09, 2020 21:49

    Same issue on 2019.3.0f5

  4. 75a7bee4bd2d3f58e9aca6747d62edc3?d=mm

    Cec

    Jan 16, 2020 10:06

    Still not fiixed in 2019.3.0f5

  5. 4b6801fbee2689f67bcf3ab3086c300d?d=mm

    Liviuss

    Jan 13, 2020 20:51

    I confirm, it's not fixed in 2019.3.0f3.

  6. 49d76b6035b403e1e7a34fe7ec8de79f?d=mm

    Rodolfo-Rubens

    Dec 27, 2019 17:55

    Not fixed in 2019.3.0f3.

  7. A154416be96c4b1abbe483d4983c435a?d=mm

    Dimonasdf

    Dec 25, 2019 15:43

    2019.2.17 stiil has this issue

  8. 4acb018505ba013061f1415d546c4fce?d=mm

    TheAnubis

    Dec 22, 2019 11:01

    It happens to me in Unity 2019.3.03f as well

  9. 1aa253ede4b410f88dfdd6d9762df526?d=mm

    hawkigamer

    Dec 20, 2019 22:02

    Found in unity 2019.3.0f3

  10. E105d5bc57d78c542a8453c916ba3138?d=mm

    KingVario

    Dec 13, 2019 14:09

    Same issue here 2019.3.0f3 Windows 10 and Android 9 reproduces this error when building game standalone for windows or android with autoconnect profiler.
    Inside editor the Semaphore high MS does not appear when profiling only when i build external development build.
    This Semaphore severely skews other profiler data.

    https://i.postimg.cc/T3vR3TtS/Capture.jpg

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