Feature flag
Related service Website & online shop
DEFINITION
A runtime switch on a code path. Gradual rollout, kill-switch, A/B tests, percent releases · all built on the same primitive. LaunchDarkly / GrowthBook are the typical providers.
- SSR (Server-Side Rendering)→
HTML rendered by the server per-request, fresh for every user. Ideal for dynamic content (dashboards), but slower than SSG.
- SSG (Static Site Generation)→
Pages are produced at build time as HTML and served from a CDN. Near-zero TTFB. DField's own site runs this way across 111+ pages.
- ISR (Incremental Static Regeneration)→
SSG + timed regeneration: the HTML is static but regenerates on a schedule. Ideal for blog content · freshness with CDN speed.
- Edge rendering→
Code runs at the CDN edge closest to the user (Cloudflare Workers, Vercel Edge). Dynamic responses with ~10–50 ms TTFB.
- RSC (React Server Components)→
React components that run exclusively on the server and never ship to the browser. Result: less client-side JS and faster hydration.
- LCP (Largest Contentful Paint)→
Time until the largest visible element paints. Google Core Web Vitals passes under 2.5s · we usually land marketing pages under 1s.