Response Time Checker

Measure server response time with multiple pings and color-coded results

Note: This tool uses the browser Fetch API. Results include DNS lookup, TLS handshake, and response time. CORS restrictions may affect some URLs. For most accurate results, test URLs that support CORS or use your own server.

Frequently Asked Questions

Why might the response time be inaccurate?

Browser-based tests use the Fetch API which is subject to CORS restrictions and browser security policies. The measured time includes DNS lookup, TLS handshake, and full response download — not just server processing time. For precise server-only timing (TTFB), use command-line tools like curl -w "%{time_starttransfer}" or dedicated monitoring services. Despite these limitations, the relative comparison between pings is still useful.

What is a good server response time?

Under 200ms is excellent (shown in green), 200-500ms is acceptable (yellow), and over 500ms is slow (red). Google recommends server response times under 200ms for optimal SEO and user experience. Factors affecting response time include server location, hosting quality, CDN usage, server load, and application optimization. A CDN can dramatically improve response times for users far from the origin server.

Does this tool work with any website?

It works best with sites that allow CORS (Cross-Origin Resource Sharing) requests. Some servers block cross-origin requests from browsers, in which case you may see a CORS error. However, the tool still measures the time until the error response, which gives a reasonable approximation of network latency. For the most reliable results, test your own domains or well-known public APIs.