Is your home page in a site collection that has the Publishing infrastructure feature activated? For example, built off the Collaborative Portal site definition. If so, then your problem is probably just that Page and Fragment caching is disabled. Go to Site Settings for your top level site.
In the Site Collection Administration column you will see an entry to Site Collection Output Cache settings. Go to that page and click the checkbox to enable Output caching. On the same page use the dropdowns to select the anonymous profile for Anonymous Cache and the Intranet profile for the Authenticated Cache. If the checkbox is already checked, make sure you aren't overriding the profiles at the site level by looking at the site output cache settings from the Site Settings page.
If this does not cause a marked improvement on the second page refresh then you have a deeper problem. But Output caching is the most common issue. If its not output caching then we need to talk about the webparts etc on the home page or any custom code you've added to the home page.
If this does not cause a marked improvement on the second page refresh then you have a deeper problem. But Output caching is the most common issue. If its not output caching then we need to talk about the webparts etc on the home page or any custom code you've added to the home page.
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