Try it yourself
How long this site's server took to start answering, page by page. SEOPert flags anything over 2.2 seconds as slow, and starts paying attention above 1 second.
Which page needs looking at?
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Quick. The homepage is usually the most cached page on a site, which is why it is a poor place to judge from.
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Fine. Well inside the range where nobody notices.
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This is the one. Nearly four seconds before a single byte comes back, and the query string is the clue: search results are built fresh every time, so they skip whatever cache protects the rest of the site. Most visitors have given up before the page starts.
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Fine, and useful as a comparison: /about is a plain page built the same way as the slow one, so the difference between them is the work being done rather than the server being tired.
Pick a line. Every one of them has an answer.
Show me the answer
/search?q=boiler 3.90 s
This is the one. Nearly four seconds before a single byte comes back, and the query string is the clue: search results are built fresh every time, so they skip whatever cache protects the rest of the site. Most visitors have given up before the page starts.
The written version
Server response time: the wait before anything appears →
How to check your own site for this, what to change, and how to confirm it worked.
Now the real thing
Run this check on your own site.
The same check, plus twenty-nine others, against your actual pages. Free, no account, about a minute.