Driver 01
Hydration cost
Low-end phones stalling while they parse and run large client bundles.
Migration playbook: Client-side SPA (Vite, CRA) → React Server Components
Client SPA to React Server Components migration
Move rendering from the browser to the server with React Server Components, so low-powered devices download and run less JavaScript.
Migration drivers
Why teams make this move
Driver 02
Business logic in the browser
Pricing rules and permission checks shipped in public JavaScript.
Driver 03
Slow first paint
Users looking at spinners while the SPA downloads and boots.
Execution sequence
How the migration runs
Each phase ends with a check you can verify — data parity, error rates, latency — and the rollback path is agreed before any traffic moves.
- 01Phase
Component boundary audit
Separating static display components from interactive widgets.
- 02Phase
Streaming layouts
Server layouts that send the page shell immediately and stream slower data in.
- 03Phase
Server Actions
Replacing client-side mutation boilerplate with Server Actions.
- 04Phase
Bundle pruning and deployment
Removing client dependencies the server now handles, and deploying behind a CDN.
Risk prevention
Pitfalls that derail this migration
Risk 01
Non-serializable props
Passing functions or class instances across the server-client boundary.
Risk 02
Server waterfalls
Sequential awaits in nested Server Components that add up to a slow response.
Risk 03
Browser APIs during rendering
Calling window or document while the page renders on the server.
Before and after
What we measure
We take a baseline before any change and report the same numbers after cutover, from your own tools. They are the evidence of whether the migration worked — not figures promised in advance.
- JS per route
- Client JavaScript, gzip, before and after
- TTFB
- Time to first byte at p75, from field data
- INP
- Interaction latency at p75 on mid-range phones
Questions
Frequently asked migration questions
Server Components run only on the server and send their rendered output — not their JavaScript — to the browser.
Yes. Interactive elements such as modals, dropdowns and animations stay client components, marked with 'use client'.
Rehearse the cutover before the real one
Tell us about your data volume, traffic and timeline. An engineer will reply within one business day to set up a call about the migration plan and its rollback path.