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About TTFB Checker

Measure server processing time—how long until the server starts responding. Isolate backend performance from network latency.

TTFB Checker is a specialized version of the Latency Test tool, focused on ttfb, server-processing, backend-optimization.

Key Features

  • Multi-region latency testing
  • Time to First Byte (TTFB)
  • Connection time measurement
  • DNS lookup time
  • Historical comparison

How TTFB Checker Works

ProbeOps TTFB Checker tests from 6 global locations to provide comprehensive results. When you run a check, our probe nodes in US East (Virginia), US West (Oregon), EU Central (Helsinki), AP South (Mumbai), CA Central (Canada), AP Southeast (Sydney) simultaneously query the target to identify regional differences and ensure global accessibility.

Results are returned in real-time with detailed breakdowns per region, allowing you to identify location-specific issues that might affect your users in different geographic areas.

Common Use Cases

  • Check if a website is down for everyone or just you
  • Monitor uptime from multiple geographic locations
  • Measure response times and TTFB globally
  • Identify regional outages affecting specific users

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API Access

All ProbeOps tools are available via REST API for automation and integration. The TTFB Checker can be called programmatically from your applications, CI/CD pipelines, or monitoring scripts. See our API documentation for integration guides.

Pricing

TTFB Checker is available on all ProbeOps plans including our free tier. Free users get 100 probes per month with access to 2 regions. Paid plans starting at $19/month include unlimited regions and higher limits. See pricing details.

Time To First Byte (TTFB) Checker

Measure server processing time—how long until the server starts responding. Isolate backend performance from network latency.

What This Checks
Multi-region latency testingTime to First Byte (TTFB)Connection time measurementDNS lookup timeHistorical comparison

About Latency Test

Test network latency and round-trip time from 6 global probe locations. Measure connection latency, TCP handshake time, and network path efficiency.

Key Features

Multi-region latency testing

Time to First Byte (TTFB)

Connection time measurement

DNS lookup time

Historical comparison

Also Available via API & MCP Server

Automate latency test checks in your CI/CD pipelines or run them directly from your AI coding agent.

REST API

Single endpoint, JSON response. Integrate into any language or platform.

cURL

curl -X POST https://probeops.com/api/v1/run \
  -H "X-API-Key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"tool": "latency_test", "target": "example.com"}'
Learn more about the API

MCP Server

Works with Claude Code, Cursor, Windsurf, and any MCP-compatible IDE.

Claude Code

> Check the latency test for example.com

Claude uses the probeops_latency_test tool to run
the check from 6 global regions and returns
structured results.
Learn more about the MCP Server

Time To First Byte (TTFB) measures specifically how long the server takes to START sending a response after receiving a request. This isolates server-side processing time—database queries, application logic, caching—from network latency and data transfer. TTFB under 200ms is good; under 100ms is excellent.

Unlike full response time tests, TTFB focuses purely on backend performance. High TTFB with low network latency points to server optimization opportunities: slow database queries, missing cache layers, inefficient code, or undersized hosting. Our multi-region TTFB test reveals if backend slowness affects all users or varies by geography.

For complete performance diagnosis, compare TTFB results with network latency to separate network delays from server processing. Check DNS performance as slow DNS adds to total wait time before TTFB even starts.

**Methodology:** HTTP request with precise TTFB isolation from 6 regions, measuring time from request sent to first response byte received.

Common Errors & How to Fix Them

4 relevant issues

What This Means

The server responded but took too long. This affects user experience and may indicate server performance issues.

How to Fix

1) Identify bottleneck: check DNS time, connect time, TTFB separately. 2) If DNS slow: switch to faster DNS provider. 3) If TTFB slow: optimize server-side code, add caching, check database queries. 4) If transfer slow: enable compression (gzip), optimize assets. 5) Consider CDN for geographic distribution.

slowlatencyhigh response timeperformance

What This Means

The gateway server didn't receive a timely response from the upstream server. The upstream server is too slow or unresponsive.

How to Fix

1) For site owners: increase timeout values (proxy_read_timeout in nginx). 2) Optimize slow backend code/queries. 3) Check database performance. 4) Add caching layers. 5) Test: curl -I -m 30 https://example.com to check response time.

504gateway timeouttimeoutslow server

What This Means

The server is temporarily unable to handle the request due to maintenance or overload. Usually temporary.

How to Fix

1) For users: wait and retry—often means scheduled maintenance. 2) For site owners: check server resources (htop, free -m). 3) Scale up if overloaded. 4) Check if maintenance mode is accidentally enabled. 5) Review rate limiting settings.

503service unavailablemaintenanceoverloaded

What This Means

The server didn't respond within the expected time. Could be server overload, network issues, or firewall blocking.

How to Fix

1) Check if server is reachable: ping example.com. 2) Test specific port: nc -vz example.com 443 -w 5. 3) Check from different location (VPN/proxy). 4) For owners: verify firewall allows traffic (ufw status), check server resources, ensure service is running.

timeoutconnection timeoutno responseunreachable
See all errors →

Frequently Asked Questions

4 relevant questions

TTFB measures the time from when you request a page to when you receive the first byte of the response. It includes DNS lookup, TCP connection, SSL handshake, and server processing time. A good TTFB is under 200ms; acceptable is under 500ms. High TTFB usually indicates server-side issues like slow databases, inefficient code, or distant servers.

latencyttfbperformance

SSL handshakes can add 100-300ms. Speed it up by: enabling TLS 1.3 (faster handshake), using OCSP stapling (avoids certificate validation delays), enabling session resumption, using smaller certificate chains, and deploying on servers with modern CPU support for cryptographic operations.

latencyssltroubleshooting

Slow DNS can add 50-200ms to every request. Causes include: slow DNS provider, too many DNS lookups (external resources), and no DNS prefetching. Fix by: using fast DNS providers (Cloudflare 1.1.1.1, Google 8.8.8.8), reducing external resources, implementing DNS prefetching (<link rel="dns-prefetch">), and using longer TTLs.

latencydnstroubleshooting

Key strategies: 1) Use a CDN to serve content from edge locations, 2) Enable HTTP/2 or HTTP/3 for faster connections, 3) Optimize server response time with caching, 4) Reduce DNS lookup time by using fast DNS providers, 5) Enable keep-alive connections, 6) Minimize redirects, 7) Use connection preloading and prefetching.

latencyoptimization
See all FAQs →

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Last updated: January 27, 2026