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Won't Fix

Votes

4

Found in

2022.2.12f1

2023.1.0b9

2023.2.0a7

Issue ID

UUM-31315

Regression

Yes

Build times are very long when building for WebGL

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Reproduction steps:
1. Open the attached "repro_IN-36000SlowBuild.zip" project
2. Open File -> Build Settings
3. Select "WebGL" and press "Build And Run"
4. Wait for the build to finish

Expected result: The build finishes in around 5 minutes
Actual result: The build finishes in around 12 minutes

Reproducible with: 2022.2.0a16, 2022.2.12f1, 2023.1.0b9, 2023.2.0a7
Not reproducible with: 2020.3.46f1, 2021.3.21f1, 2022.2.0a15

Reproducible on: Windows 10, macOS 13.2.1 (M1) (by the reporter)

  1. Resolution Note:

    Upgrading version of emscripten resulted in longer build times when performing Release builds. Currently unable to identify a regression in build times after that change was made.

    If this is impacting you please add a comment on this issue or add additional details in the existing forum thread here: https://forum.unity.com/threads/webgl-build-linking-build-js-wasm-takes-forever.1315203/

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Comments (5)

  1. ProGameDevUser

    Nov 14, 2023 15:50

    "Won't Fix" - Is this a joke???

  2. atomikm

    Jul 17, 2023 22:37

    This issue is still happening on 2022.3.3f1 LTS

    Build time used to take a few minutes and now won't complete after 2 hours

    Macbook Pro 2021
    Unity 2022.3.3f1

  3. Nodo42

    Jun 12, 2023 12:25

    Seems like multithreading is not used on Runtime Speed and Disk Size on Code Optimization, this why it takes so long

  4. therobby3

    Mar 28, 2023 19:54

    Also having the issue. Here is some info on my end:

    Offhand, I'll provide some quick info I have.

    Operating system: Windows 10 Home. OS build: 19045.2728
    Processor: Intel i7-7700
    Unity Editor version: 2022.2.12
    Code optimization setting: Runtime speed
    Time taken to complete: Roughly 40 minutes. Was previously in the ballpark of 6 minutes in Unity 2021.

  5. amateurd

    Mar 28, 2023 14:51

    "Linking build js.wasm" can take several hours.

    Deleting the Library folder and the Temp folder does stop the problem happening, but only for a time on before it comes back. It would be more understandable with old projects but here it happens on a brand new project created in Unity 2022.2.11 containing one scene, one GameObject and one script.

    Perhaps we could ask for a feature to be added to Unity so it will delete and rebuild the LIbrary folder before each WebGL build?

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