When architecting a content website, one of the first architectural forks in the road is deciding between Static Site Generation (SSG) and Server-Side Rendering (SSR). Both paradigms have merits, but their trade-offs differ dramatically in production.

Understanding Static Site Generation (SSG)

With SSG, every page is compiled into static HTML, CSS, and assets during build time. When a reader requests /blog/building-headless-sites, the web server or CDN returns an existing pre-rendered HTML file directly from the filesystem or memory cache.

When SSG Wins

• Content Doesn't Change Every Millisecond: Editorial articles, whitepapers, and guides are read millions of times but updated only occasionally.
• Absolute Uptime: If the WordPress origin server crashes, goes down for maintenance, or runs out of PHP memory, the static website remains 100% online.
• Zero Cloud Infrastructure Costs: Serving static assets from global CDNs costs pennies compared to running auto-scaling Node.js server clusters.

When Does SSR Make Sense?

Server-Side Rendering executes code on every incoming request. SSR is necessary when:

• Pages require real-time personalization based on session cookies or geolocation.
• Content catalogs consist of millions of dynamic product pages that cannot be pre-built in a reasonable CI window.
• Gated paywalls require per-user authorization checks before rendering.

The Editorial Consensus

For high-performance digital publications, SSG paired with webhook-driven on-demand rebuilds is the gold standard of speed, reliability, and cost-efficiency.