Bad performance on v1.16.200.X builds

Partner Rank: 1

Partner Team Reporting: Gamemode One

Verification builds: U2 (v1.16.200.X) - Windows 10

Summary:

Performance on the U2 builds is very bad, essentially making our upcoming product unplayable.

Impact:

The affected product is part of the Creator Update promotions. This issue needs to be resolved before U2 releases so the world stays playable.

Repro Steps:

1. Open the provided world on U1 (v1.16.100.X) & U2 (v1.16.200.X)
2. Observe the significantly worse performance on U2

Observed Results:

The product is very laggy. We're observing the task "Extract Frame" (seems to be connected to particles) taking 10-15ms on U2 as opposed to 1-2ms on U1. Especially the "tick" & "extract" subtask seem to take a lot more time.
The lag gets worse while flying over the world with the "Extract Frame" task sometimes running for 100ms or more.

We are believing that the issue is mostly due to the "Extract Frame" task but there could be another reason hiding inside of our profiler captures that isn't as visible.

Expected Results:

The world should run smoothly.

Screenshots/Videos attached: Yes/No

Yes

Regression Builds:

U1 (v1.16.100.X) runs our product fine.

Notes:

• The world can be downloaded from our #mco_gm1 slack channel
• The performance issues are observed by all of our team members