💻 Web Architecture

SSR vs. CSR vs. Static Site Generation: TTFB, Core Web Vitals & SEO

By Enterprise Web Architecture & Full-Stack Engineering Review Board•September 2, 2026

Architectural Takeaways

Rendering architecture shootout: evaluating Server-Side Rendering (SSR), Client-Side Single Page Apps (SPA), and Incremental Static Regeneration (ISR).

Choosing the correct rendering architecture dictates search engine crawlability, Time to First Byte (TTFB), and First Contentful Paint (FCP) across diverse network conditions.

1. Rendering Paradigms Compared

Rendering Architecture	TTFB Latency	FCP & LCP Performance	SEO Crawl Efficiency	Server Compute Cost
Server-Side Rendering (SSR)	50 – 150ms	Fast (< 1.0s)	100% Immediate HTML	Moderate (CPU per request)
Client-Side SPA (CSR)	< 20ms (Static CDN)	Slow (1.8s – 3.5s bundle wait)	Requires Googlebot JS execution	Near-zero (Static storage)
Static Site Generation (SSG)	< 20ms (Edge CDN)	Instantaneous (< 0.6s)	100% Pre-rendered	Near-zero

Enterprise Web Architecture & Full-Stack Engineering Review Board

Our team of senior full-stack architects, Core Web Vitals engineers, and UI/UX directors audits application latency, React SSR rendering pipelines, and WCAG accessibility standards.

Ready to Accelerate Your Enterprise Web Infrastructure?

Get a comprehensive architectural review, performance audit, and custom proposal.

Request Architecture Consultation →

← View All 16 Architecture & Performance Guides