fix: Improve Core Web Vitals (LCP and CLS) #48

New Issue

MrUnknownDE · 2026-04-05T16:18:45+02:00

MrUnknownDE commented

2026-04-05 16:18:45 +02:00

Originally created by @simlarsen on 3/4/2026

Summary

Fixes Desktop CLS (0.21 → <0.1) on 35 /docs URLs by removing redundant Tailwind CDN — the compiled CSS in style.css already contains all needed utilities; the CDN was re-processing styles and causing layout shifts
Fixes Mobile LCP (2.7s → <2.5s) on 311 URLs by deferring PostHog analytics via requestIdleCallback, reducing Google Fonts to only used weights (400–800), moving <meta charset>/<meta viewport> to top of <head>, and adding defer to highlight.js on blog posts
Adds DNS prefetch for PostHog domain to keep analytics latency low after deferral

Test plan

Verify /docs pages render correctly without Tailwind CDN (all styles come from compiled style.css)
Verify homepage, pricing, blog, and about pages still render correctly with deferred PostHog
Confirm PostHog analytics events (page_view, CTA clicks, UTM tracking) still fire after deferral
Run PageSpeed Insights on /pricing (mobile) to verify LCP < 2.5s
Run PageSpeed Insights on /docs (desktop) to verify CLS < 0.1
After deploy, click "Validate Fix" in Google Search Console for both issues

🤖 Generated with Claude Code

*Originally created by @simlarsen on 3/4/2026* ## Summary - **Fixes Desktop CLS** (0.21 → <0.1) on 35 `/docs` URLs by removing redundant Tailwind CDN — the compiled CSS in `style.css` already contains all needed utilities; the CDN was re-processing styles and causing layout shifts - **Fixes Mobile LCP** (2.7s → <2.5s) on 311 URLs by deferring PostHog analytics via `requestIdleCallback`, reducing Google Fonts to only used weights (400–800), moving `<meta charset>`/`<meta viewport>` to top of `<head>`, and adding `defer` to highlight.js on blog posts - Adds DNS prefetch for PostHog domain to keep analytics latency low after deferral ## Test plan - [ ] Verify `/docs` pages render correctly without Tailwind CDN (all styles come from compiled `style.css`) - [ ] Verify homepage, pricing, blog, and about pages still render correctly with deferred PostHog - [ ] Confirm PostHog analytics events (page_view, CTA clicks, UTM tracking) still fire after deferral - [ ] Run PageSpeed Insights on `/pricing` (mobile) to verify LCP < 2.5s - [ ] Run PageSpeed Insights on `/docs` (desktop) to verify CLS < 0.1 - [ ] After deploy, click "Validate Fix" in Google Search Console for both issues 🤖 Generated with [Claude Code](https://claude.com/claude-code)

MrUnknownDE closed this issue

2026-04-05 16:18:45 +02:00

MrUnknownDE referenced this issue

2026-04-05 16:57:34 +02:00

Create github-build.realtime.yaml #2308

MrUnknownDE referenced this issue

2026-04-05 16:57:36 +02:00

Create docker-build.apidocs.yml #2309

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Reference: github/oneuptime#48