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Performance · Free Tool

Free TTFB Checker

TTFB (Time to First Byte) measures how long it takes for your server to start sending data after receiving a request. A slow TTFB (over 600ms) bottlenecks everything else — no amount of frontend optimization can fully compensate. This tool measures your server's response time using Google Lighthouse.

scheduleSpeed tests typically take 15–30 seconds.

What This Tool Checks

  • check_circleTTFB in milliseconds with Good/Needs Improvement/Poor verdict
  • check_circleGood threshold: under 800ms; Needs Improvement: 800ms–1800ms; Poor: over 1800ms
  • check_circleServer response time breakdown from Lighthouse audit
  • check_circleCDN detection (whether a CDN is caching responses)
  • check_circleComparison with LCP to understand TTFB's share of total load time
  • check_circleServer-side improvement recommendations
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Why This Matters for SEO

TTFB is the foundation of all performance metrics. Every millisecond of TTFB adds directly to LCP, FCP, and total load time. A slow TTFB (over 1.8 seconds) is classified as "Poor" by Google and can single-handedly cause failing Core Web Vitals scores. The most common TTFB fixes are: using a CDN, enabling server-side caching, upgrading hosting, and optimizing database queries.

Want this audit running on every page of your site, every day? See PerfBee Performance Boost — Continuous Core Web Vitals monitoring with deploy comparisons and AI fix suggestions.

Frequently Asked Questions

What is Time to First Byte (TTFB)?expand_more
TTFB measures the time from when the browser sends a request to a server until the browser receives the first byte of the response. It includes: DNS lookup time, TCP connection time, TLS handshake time (for HTTPS), server processing time (generating the page), and network transfer time for the first byte. A high TTFB means your server is slow to generate or send responses.
What is a good TTFB?expand_more
Google's recommended TTFB threshold is under 800ms. Under 800ms is "Good," 800ms–1800ms is "Needs Improvement," and over 1800ms is "Poor." Most well-configured sites achieve TTFB under 200ms with a CDN. Shared hosting without caching often produces TTFB of 800ms–2000ms. Dynamic sites generating pages on every request (without caching) are the most common source of slow TTFB.
How do I reduce TTFB?expand_more
Key TTFB improvements: (1) Use a CDN (Content Delivery Network) — serves cached responses from servers near your users, reducing network latency. (2) Enable server-side caching — cache rendered HTML instead of regenerating it on every request. (3) Upgrade hosting — cheap shared hosting often has slow TTFB; VPS or cloud hosting is much faster. (4) Optimize database queries — slow queries are the most common cause of slow dynamic page generation. (5) Use HTTP/2 or HTTP/3.
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Monitor TTFB and uptime in real time

A slow server affects every visitor, every page. PerfBee monitors uptime and TTFB with alerts the moment your server slows down or goes offline. Get daily crawl reports, broken link alerts, Core Web Vitals tracking, and AI fix suggestions — across your entire site.

  • checkCrawl unlimited pages — daily, automatic
  • checkBroken link detection across your whole site
  • checkCore Web Vitals & Lighthouse audits per page
  • checkAI-powered code fix suggestions
  • checkWhite-label PDF reports for clients
  • checkEmail alerts for new issues & downtime
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