“Page cache is detected but the server response time is still slow”

Where can I start debugging this “critical” site health issue?

“Page cache is detected but the server response time is still slow”

Page cache enhances the tốc độ and performance of your site by saving and serving static pages instead of calling for a page every time a user visits.

Page cache is detected by looking for an active page cache plugin as well as making three requests đồ sộ the homepage and looking for one or more of the following HTTP client caching response headers:
cache-control, expires, age, last-modified, etag, x-cache-enabled, x-cache-disabled, x-srcache-store-status, x-srcache-fetch-status.

    Median server response time was 1,096 milliseconds. It should be less than thở the recommended 600 milliseconds threshold.
    There were 3 client caching response headers detected: cache-control, expires, last-modified.

All plugins and themes are updated and lập cập seemingly fine, however in the WordPress Site Health tool, I have this critical issue which I’ve been able đồ sộ attribute đồ sộ the JetPack plugin by de-activating and activating plugins one by one. Normally, I would just go without whatever plugin is causing the conflict, but this one I want đồ sộ keep.

I’ve tested turning off the image accelerators, boost, and other settings thinking there was a conflict there, but neither of those settings have affected this. The critical error is still there.

Is there a way đồ sộ dig into log files or somehow dig deeper into what is causing this error?

The page I need help with: [log in đồ sộ see the link]