## Context As part of the Rapid Diffs effort, we have set acceptance criteria for performance gains: https://handbook.gitlab.com/handbook/engineering/architecture/design-documents/rapid_diffs/#acceptance-criteria > 5. The Time to First Diff (mr-diffs-mark-first-diff-file-shown) happens before 1.5 seconds mark for diffs of 1000 lines changed or less. 2 seconds above 1000 changed lines. > 6. The metric for Fully Loaded (all diffs rendered) registers 25-40% improvement for diffs up to 20 files and 700 lines changed. See the [improvement formula](https://handbook.gitlab.com/handbook/engineering/architecture/design-documents/rapid_diffs/#fully-loaded-improvement-formula) for details. ## Goal Verify these criteria have been met by using the sitespeed tracking set up in https://gitlab.com/gitlab-org/gitlab/-/work_items/594923, and later updated with https://gitlab.com/gitlab-org/gitlab/-/work_items/596942. ## Metrics Staging: * Average diff (5 files, 500 lines): [MR (enabled)](https://dashboards.gitlab.net/d/fe-perf-sitespeed-page-metrics/fe-perf3a-fe-perf3a-sitespeed-page-metrics?var-function=median&orgId=1&from=now-7d&to=now&timezone=browser&var-path=desktop&var-testname=gitlab&var-group=staging_gitlab_com&var-page=CodeReview_MR_Rapid_Diffs_Enabled_v2_Average_5_Files&var-browser=chrome&var-connectivity=cable) · [MR (disabled)](https://dashboards.gitlab.net/d/fe-perf-sitespeed-page-metrics/fe-perf3a-fe-perf3a-sitespeed-page-metrics?var-function=median&orgId=1&from=now-7d&to=now&timezone=browser&var-path=desktop&var-testname=gitlab&var-group=staging_gitlab_com&var-page=CodeReview_MR_Rapid_Diffs_Disabled_v2_Average_5_Files&var-browser=chrome&var-connectivity=cable) * Big diff (10 files, 1,000 lines): [MR (enabled)](https://dashboards.gitlab.net/d/fe-perf-sitespeed-page-metrics/fe-perf3a-fe-perf3a-sitespeed-page-metrics?var-function=median&orgId=1&from=now-7d&to=now&timezone=browser&var-path=desktop&var-testname=gitlab&var-group=staging_gitlab_com&var-page=CodeReview_MR_Rapid_Diffs_Enabled_v2_Big_10_Files&var-browser=chrome&var-connectivity=cable) · [MR (disabled)](https://dashboards.gitlab.net/d/fe-perf-sitespeed-page-metrics/fe-perf3a-fe-perf3a-sitespeed-page-metrics?var-function=median&orgId=1&from=now-7d&to=now&timezone=browser&var-path=desktop&var-testname=gitlab&var-group=staging_gitlab_com&var-page=CodeReview_MR_Rapid_Diffs_Disabled_v2_Big_10_Files&var-browser=chrome&var-connectivity=cable) * Massive diff (50 files, 5,000 lines): [MR (enabled)](https://dashboards.gitlab.net/d/fe-perf-sitespeed-page-metrics/fe-perf3a-fe-perf3a-sitespeed-page-metrics?var-function=median&orgId=1&from=now-7d&to=now&timezone=browser&var-path=desktop&var-testname=gitlab&var-group=staging_gitlab_com&var-page=CodeReview_MR_Rapid_Diffs_Enabled_v2_Massive_50_Files&var-browser=chrome&var-connectivity=cable) · [MR (disabled)](https://dashboards.gitlab.net/d/fe-perf-sitespeed-page-metrics/fe-perf3a-fe-perf3a-sitespeed-page-metrics?var-function=median&orgId=1&from=now-7d&to=now&timezone=browser&var-path=desktop&var-testname=gitlab&var-group=staging_gitlab_com&var-page=CodeReview_MR_Rapid_Diffs_Disabled_v2_Massive_50_Files&var-browser=chrome&var-connectivity=cable) Dashboards for v2 scenarios in the Rapid Diffs Scenarios project (production): * Average diff (5 files, 500 lines): [MR (enabled)](https://dashboards.gitlab.net/d/fe-perf-sitespeed-page-metrics/fe-perf3a-fe-perf3a-sitespeed-page-metrics?var-function=median&orgId=1&from=now-7d&to=now&timezone=browser&var-path=desktop&var-testname=gitlab&var-group=gitlab_com&var-page=CodeReview_MR_Rapid_Diffs_Enabled_v2_Average_5_Files&var-browser=chrome&var-connectivity=cable) · [MR (disabled)](https://dashboards.gitlab.net/d/fe-perf-sitespeed-page-metrics/fe-perf3a-fe-perf3a-sitespeed-page-metrics?var-function=median&orgId=1&from=now-7d&to=now&timezone=browser&var-path=desktop&var-testname=gitlab&var-group=gitlab_com&var-page=CodeReview_MR_Rapid_Diffs_Disabled_v2_Average_5_Files&var-browser=chrome&var-connectivity=cable) * Big diff (10 files, 1,000 lines): [MR (enabled)](https://dashboards.gitlab.net/d/fe-perf-sitespeed-page-metrics/fe-perf3a-fe-perf3a-sitespeed-page-metrics?var-function=median&orgId=1&from=now-7d&to=now&timezone=browser&var-path=desktop&var-testname=gitlab&var-group=gitlab_com&var-page=CodeReview_MR_Rapid_Diffs_Enabled_v2_Big_10_Files&var-browser=chrome&var-connectivity=cable) · [MR (disabled)](https://dashboards.gitlab.net/d/fe-perf-sitespeed-page-metrics/fe-perf3a-fe-perf3a-sitespeed-page-metrics?var-function=median&orgId=1&from=now-7d&to=now&timezone=browser&var-path=desktop&var-testname=gitlab&var-group=gitlab_com&var-page=CodeReview_MR_Rapid_Diffs_Disabled_v2_Big_10_Files&var-browser=chrome&var-connectivity=cable) * Massive diff (50 files, 5,000 lines): [MR (enabled)](https://dashboards.gitlab.net/d/fe-perf-sitespeed-page-metrics/fe-perf3a-fe-perf3a-sitespeed-page-metrics?var-function=median&orgId=1&from=now-7d&to=now&timezone=browser&var-path=desktop&var-testname=gitlab&var-group=gitlab_com&var-page=CodeReview_MR_Rapid_Diffs_Enabled_v2_Massive_50_Files&var-browser=chrome&var-connectivity=cable) · [MR (disabled)](https://dashboards.gitlab.net/d/fe-perf-sitespeed-page-metrics/fe-perf3a-fe-perf3a-sitespeed-page-metrics?var-function=median&orgId=1&from=now-7d&to=now&timezone=browser&var-path=desktop&var-testname=gitlab&var-group=gitlab_com&var-page=CodeReview_MR_Rapid_Diffs_Disabled_v2_Massive_50_Files&var-browser=chrome&var-connectivity=cable)