Various light-related events incur a CPU cost in scenes with baked lights

Unity: Universal RP

Won't Fix

2023.1.X

2022.2.X

2022.1.X

2021.3.X

2020.3.X

We are working on Forward+ and RenderGraph that is rewriting parts of these functions. The current runtime cost of these functions is in the order of 0.0x ms which is not enough user pain to justify we improve the old code path.

Steps to reproduce

Download the attached project (BakedLightsCPUSpike-URP.zip)
Open the EmptyScene
Open the Profiler window, and in the search box, type in "light"
Enter Play mode
Press T on the keyboard to load a scene additively
Scrub through the graph until you find the the events matching the "light" search query

Expected behavior

Light-related events should not incur a CPU cost when there are no realtime lights in the scene

Actual behavior

Various events incur multiple milliseconds worth of CPU time even when there are no realtime lights present (check the attached screenshot)

Notes

Reproduces in: 2020.3.40f1, 2021.3.11f1, 2022.1.13f1, 2022.2.0b8, 2023.1.0a11
Tested on macOS
Only reproduces upon the loading the scene initially; does not reproduce upon loading and unloading that same scene after it had been initialized

Various light-related events incur a CPU cost in scenes with baked lights

Unity: Universal RP

Won't Fix

Prioritise and Follow this issue

Have a workaround or additional info about this issue?

Various light-related events incur a CPU cost in scenes with baked lights

Unity: Universal RP

Statuses

Won't Fix

Resolution Notes

2023.1.XWon't FixWe are working on Forward+ and RenderGraph that is rewriting parts of these functions. The current runtime cost of these functions is in the order of 0.0x ms which is not enough user pain to justify we improve the old code path.

Description

Prioritise and Follow this issue

Have a workaround or additional info about this issue?