Site Health Tools Critical Issue

Greetings, I am trying your very easy to use plugin on a brochure site. I like how easy it is to use, however I am getting a critical issue in my WordPress Site Health report that I don’t get with other caching solutions. Here is the output on the report:

1 critical issue

Critical issues are items that may have a high impact on your sites performance or security, and resolving these issues should be prioritized.Page cache is detected but the server response time is still slowPerformance

Page cache enhances the speed 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 to 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 1,715 milliseconds. It should be less than the recommended 600 milliseconds threshold.
• ?There were 2 client caching response headers detected:?cache-control,?expires.

I have checked that htaccess is writable, and I think I might be able to resolve by adding some code there, but shouldn’t the plugin be handling this?

Thank you!

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