Observed Signal · May 23, 2026 · Migration / Case Study · Source: DEV Community · Impact: 2/5 · Sentiment: Positive
200‑Site Case Study: Migrating from React to HTMX
An engineering team at Alesta WEB describes migrating a React single-page admin panel to HTMX across more than 200 production sites. The migration (started Q3 2025, completed route-by-route over six months) used parallel routes so both stacks coexisted while features were moved one sprint at a time; the final React bundle was removed in week 22. Measured improvements include a gzipped admin bundle shrinking from ~800 KB to ~50 KB, LCP (Istanbul p75) improving from ~3.2s to ~1.1s, TTI falling from 4.1s to 1.2s, and production build time dropping from 90s to 6s. Trade-offs included a ~22% increase in backend p95 response time (server CPU moved some work server-side) and loss of offline/optimistic UI behaviors. The post documents common HTMX patterns (form submits, infinite scroll, modal fragments), testing and cultural impacts, and recommends spike experiments for similar CRUD admin workloads.
Practical, measurable case study showing large performance and developer-experience gains for CMS/admin workloads; useful for publishers and platform teams but not industry-shifting.
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Key Takeaways & Evidence Grounding
- Alesta WEB migrated an admin React SPA to HTMX across 200+ production sites, starting in Q3 2025 and completing route-by-route over six months.
- Admin bundle (gzipped) dropped from ~800 KB to ~50 KB (≈‑94%).
- LCP (Istanbul, p75) improved from 3.2s to 1.1s; TTI improved from 4.1s to 1.2s.
- Production build time decreased from 90s to 6s; dev rebuilds from 8s to <1s.
- Backend response p95 increased from 180ms to 220ms (+22%) due to server-side rendering and partial rendering CPU cost.
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Related Market Signals & Shifts
Recent verified developments and strategic activity across this market segment.
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