ci: gate the homepage on lighthouse budgets #24

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me merged 2 commits from ci/lighthouse into main 2026-08-30 04:12:13 +00:00

Conversation 0 Commits 2 Files changed 7 +818 -93

me commented 2026-08-30 03:41:47 +00:00

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Adds Lighthouse CI as a PR gate, alongside the existing perf/homepage-loop.mjs.
The two do different jobs: the loop asserts exact gzipped byte budgets under
pinned throttling, Lighthouse covers the audits and the score.

dist is served by perf/serve-dist.mjs — the loop's static server, extracted
so both tools measure the same bytes Caddy sends. Three runs, median asserted.

Budgets in lighthouserc.json, calibrated locally (score 90–92, FCP 2.2s,
LCP 3.1s, TBT 110ms, CLS 0) with headroom for a slower runner:

assertion	budget
performance score	≥ 0.85
CLS	≤ 0.05
TBT	≤ 500ms
FCP	≤ 3000ms
LCP	≤ 4200ms

modern-image-formats, uses-responsive-images, unused-javascript and
render-blocking-resources are warnings — visible, not blocking.

Reports upload as an artifact. The job runs on pull requests only, matching e2e.

Also drops a stale comment in ci.yml claiming build:ci skips a prerender
step; prerendering was removed in 6a569e2 and build:ci is now identical to
build.

Adds Lighthouse CI as a PR gate, alongside the existing `perf/homepage-loop.mjs`. The two do different jobs: the loop asserts exact gzipped byte budgets under pinned throttling, Lighthouse covers the audits and the score. `dist` is served by `perf/serve-dist.mjs` — the loop's static server, extracted so both tools measure the same bytes Caddy sends. Three runs, median asserted. Budgets in `lighthouserc.json`, calibrated locally (score 90–92, FCP 2.2s, LCP 3.1s, TBT 110ms, CLS 0) with headroom for a slower runner: | assertion | budget | |---|---| | performance score | ≥ 0.85 | | CLS | ≤ 0.05 | | TBT | ≤ 500ms | | FCP | ≤ 3000ms | | LCP | ≤ 4200ms | `modern-image-formats`, `uses-responsive-images`, `unused-javascript` and `render-blocking-resources` are warnings — visible, not blocking. Reports upload as an artifact. The job runs on pull requests only, matching e2e. Also drops a stale comment in `ci.yml` claiming `build:ci` skips a prerender step; prerendering was removed in 6a569e2 and `build:ci` is now identical to `build`.

me added 1 commit 2026-08-30 03:41:47 +00:00

ci: gate the homepage on lighthouse budgets d4461b7849

me added 1 commit 2026-08-30 03:49:11 +00:00

ci: pin lighthouse-ci in the lockfile 72a7569a79

me force-pushed ci/lighthouse from 72a7569a79 to c6dc86bafc 2026-08-30 03:57:03 +00:00 Compare

me merged commit 5279350632 into main 2026-08-30 04:12:13 +00:00

me deleted branch ci/lighthouse 2026-08-30 04:12:13 +00:00

me referenced this pull request from a commit 2026-08-30 04:12:15 +00:00

ci: gate the homepage on lighthouse budgets

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