Unity Issue Tracker - [CompilationPipeline] Project recompile and package changes takes a long time when Project includes a lot of packages

Fixed in 2021.1.X

Votes

10

Found in

2019.4

2020.1

2020.2

2020.2.0a21

Issue ID

1272396

Regression

No

[CompilationPipeline] Project recompile and package changes takes a long time when Project includes a lot of packages

Scripting

Aug 23, 2020

Reproduction steps:
1. Open the user's attached project, or add attached "manifest.json" file to an empty project
2. Open Window > Analysis > Editor Iteration Profiler
3. Select "Enable" in Editor Iteration Profiler
4. Open Window > Analysis > Compilation Timeline
5. Press "Recompile", this just does a full recompile using CompilationPipeline.RequestScriptCompilation API

Expected result: Recompilation takes less than a minute
Actual result: Logged recompilation takes around a minute after that Editor becomes unresponsive for ~3-4 minutes while maintaining extremely high CPU and RAM usage (~80-90%)

Reproducible with: 2019.4.9f1, 2020.1.4f1, 2020.2.0b1
Couldn't test with: 2018.4 (errors after downgrade)

Note:
1. Using attached "manifest-2019.4.json", Editor freezes upon launch, takes all RAM memory, and needs to be ended using Task Manager - this issue is reported separately as case 1273659
2. Repro project doesn't have any assets but includes a lot of Unity Packages

Resolution Note (fix version 2021.1):

Fixed in 2021.1.0a7

Comments (2)

CodePoKE

Sep 10, 2021 13:08

For those affected by this, we are currently doing all package management through the manifest outside Unity, which avoids this bug. (2020.3.x LTS)

Compilation times are egregious (>4 minutes on simple projects).
ELenDiL_Unity

Sep 18, 2020 02:23

It also affects third party packages.
Very slow, Import a package like peek takes 40 mins to finish.

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