Response Time Checker / Glossary
Download time
The time from the first byte to the last byte of the response. For an HTML page it depends on the size of the document, compression and the connection's bandwidth.
How we measure it
From the first byte to the end of the body, per sample.
What good looks like
A few milliseconds for a compressed HTML page of typical size.
How to improve it
- Enable Brotli or gzip for HTML, CSS and JavaScript.
- Keep the HTML document lean (inline only what the first screen needs).
Measure your site
Three cold samples, every phase, and a diagnosis of what is slow.
Open the Response Time Checker