¿Qué es el TTFB?
TTFB (Time to First Byte) measures the time between a client sending an HTTP request and receiving the first byte of the response. It reflects server responsiveness and is a key web performance metric. A fast TTFB indicates efficient server processing, while a slow TTFB suggests backend bottlenecks.
Cómo Funciona
TTFB includes three components: DNS lookup time, TCP connection time, and server processing time. After the browser resolves the domain, establishes a connection, and sends the request, TTFB measures how long the server takes to begin sending the response.
Por Qué Importa
TTFB directly impacts user experience and SEO. Google considers server response time as a ranking factor. A TTFB above 600ms is considered slow. Optimizing TTFB improves perceived performance and Core Web Vitals scores.
Problemas Comunes
- Slow database queries increasing server processing time
- No server-side caching causing redundant computation
- Geographic distance between user and server
- Overloaded servers with insufficient resources
Herramientas de Diagnóstico
Monitor TTFB
Track server response times and get alerted when TTFB exceeds acceptable thresholds.