Improve browser Total Blocking Time (TBT) performance of Project Files Tree page into S2 tier
The Project Files Tree page's browser Total Blocking Time (TBT) performance is unperformant:
* Environment: 10k
* Environment Version: 15.0.0-pre `bb46288cf63`
* Date: 2022-05-10
NAME | FCP (ms) | LCP (ms) | TBT (ms) | SI (ms) | LVC (ms) | TFR SIZE (kb) | SCORE | RESULT
--------------------------------------|----------|----------------|------------------|---------|----------|---------------|-------|-------
web_project_files | 985 | ✓ 1687 (<2500) | ✘ 9983 (<9000) | 1258 | 6550 | 432.2 | 67 | FAILED
The Project Files Tree page being tested can be seen here on Staging. This page is showing files under project's directory, below is the screenshot of page's historical test TBT results
Test Details
Testing was done on our 10k Reference Architecture environment with our lab condition SiteSpeed pipeline (named GitLab Browser Performance Tool internally). The project being tested is a copy of gitlabhq (tarball can be found here). GitLab Browser Performance Tool tests information is listed at Current test details page.
The latest GitLab Browser Performance pipeline results can always be found here. Through this page the full SiteSpeed report can be found via the SiteSpeed Report
link on that page.
As per our performance targets this page's TBT metric is regularly above the target of 9000 ms which is severity1 . Task is to improve the page's browser performance into next tier.