Unity Issue Tracker - GarbageCollector CPU usage spikes when a Scene is loaded

Fixed

6.2.X

Won't Fix

6.1.X

6.0.X

2022.3.X

2021.3.X

Added a new option "Force GC on Scene Load"

We have a fix for this landed in Unity 6.2 but are not planning on backporting it because it's an opt-in feature. We'd happily review this if there is demand for it in these older Unity versions.

How to reproduce:
1. Open the attached "IN-86602" project
2. Enter Play mode
3. Open the Profiler window (Window → Analysis → Profiler)
4. In the Profiler window observe the CPU Usage module and look at Highlights for any spikes in CPU usage

Expected result: GarbageCollector does not cause any spikes in CPU usage
Actual result: GarbageCollector causes a CPU usage spike (~150-200 ms in the project)

Reproducible with: 2021.3.45f1, 2022.3.51f1, 6000.0.24f1, 6000.1.0a1

Reproduced on: Windows 11
Not reproduced on: No other environment tested

Notes:

The CPU usage spike seems to be related to Asset GarbageCollector whenever a Scene is loaded

GarbageCollector CPU usage spikes when a Scene is loaded

Unity: Optimization

Fixed

Won't Fix

Prioritise and Follow this issue

Have a workaround or additional info about this issue?

GarbageCollector CPU usage spikes when a Scene is loaded

Unity: Optimization

Fixed

Won't Fix

Prioritise and Follow this issue

Have a workaround or additional info about this issue?

GarbageCollector CPU usage spikes when a Scene is loaded

Unity: Optimization

Statuses

Fixed

Won't Fix

Resolution Notes

6.2.XFixedAdded a new option "Force GC on Scene Load"

6.1.XWon't FixWe have a fix for this landed in Unity 6.2 but are not planning on backporting it because it's an opt-in feature. We'd happily review this if there is demand for it in these older Unity versions.

6.0.XWon't FixWe have a fix for this landed in Unity 6.2 but are not planning on backporting it because it's an opt-in feature. We'd happily review this if there is demand for it in these older Unity versions.

2022.3.XWon't FixWe have a fix for this landed in Unity 6.2 but are not planning on backporting it because it's an opt-in feature. We'd happily review this if there is demand for it in these older Unity versions.

2021.3.XWon't FixWe have a fix for this landed in Unity 6.2 but are not planning on backporting it because it's an opt-in feature. We'd happily review this if there is demand for it in these older Unity versions.

Description

Prioritise and Follow this issue

Have a workaround or additional info about this issue?

GarbageCollector CPU usage spikes when a Scene is loaded

Unity: Optimization

Statuses

Fixed

Won't Fix

Resolution Notes

6.2.XFixedAdded a new option "Force GC on Scene Load"

6.1.XWon't FixWe have a fix for this landed in Unity 6.2 but are not planning on backporting it because it's an opt-in feature. We'd happily review this if there is demand for it in these older Unity versions.

6.0.XWon't FixWe have a fix for this landed in Unity 6.2 but are not planning on backporting it because it's an opt-in feature. We'd happily review this if there is demand for it in these older Unity versions.

2022.3.XWon't FixWe have a fix for this landed in Unity 6.2 but are not planning on backporting it because it's an opt-in feature. We'd happily review this if there is demand for it in these older Unity versions.

2021.3.XWon't FixWe have a fix for this landed in Unity 6.2 but are not planning on backporting it because it's an opt-in feature. We'd happily review this if there is demand for it in these older Unity versions.

Description

Prioritise and Follow this issue

Have a workaround or additional info about this issue?