For remote builds, we are currently creating (empty) container layers for scroll frames that have a (0, 0) scroll range. I've noticed a lot of these in my testing, so we could cull many useless container layers.
Created attachment 525701 [details] [diff] [review] Do not create container layers for scrollboxes with (0, 0) scrollRange
This may fix a Talos regression from 642246.
Before we can consider this, how big is the regression and is it definitely solved by this patch?
We saw a Tp4 increase 9.69% on Nokia n900 mobile, but couldn't verify that this was a regression on Android devices. Mark said that an improvement occurred in a changeset range that included this bug and a cedar merge. It's low risk patch, but then again, we're not very confident that there was a real Android regression or that this is the patch that fixed it.
Given the lack of obvious gain here we'll wait for 6 to get this. If there's a significant provable benefit here on a tier 1 platform then please renominate.