If a webpage consistently reports the reduce server response time warning it’s something to worry about: if it’s a one off, probably not an issue.
Either means your server isn’t configured particularly well and/or the server is struggling with the load (too much traffic for example).
Needs further investigation.
Interestingly the website owned by the creator of the Yoast WordPress SEO plugin consistently generates the reduce server response time warning: or did when I wrote Is Yoast the Best WordPress SEO Plugin?
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