Open-source lab compares SSG, SSR, and ISR rendering performance on real WordPress content

Short summary

The author built an open-source test lab (astro-wp-seo-lab) that renders the same WordPress content four ways using Astro 7.1.1: full SSG, SSR, SSR with CDN cache, and route caching (ISR). The lab lets developers run side-by-side comparisons to see real differences in freshness, caching behavior, and SEO tradeoffs. Key finding: SSG timestamps are frozen at build time, SSR changes per request, and route caching with TTL delivers ISR behavior that balances freshness and cost.

• •Open-source lab compares SSG, SSR, SSR-CDN, and route-cache (ISR) rendering of identical WordPress content
• •SSG freezes content at build time; SSR renders per request; route caching with TTL provides ISR behavior
• •SEO tradeoff: SSR reflects edits instantly but costs 10,000 renders for 10,000 Googlebot crawls vs SSG rebuild-on-change

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