We are experiencing some performance issues with our website and on investigation it appears that the our caching mechanism doesn't seem to be working.
For example, Template A loads Template B as an embed (embed=""). Template B is not directly accessible via the website, ie its just meant to be an embed file not a full web page.
Template B has been set to Enable Cache with a Refresh Interval of 525600 (1 year). When I clear the cache and load Template B via the browser it takes 60+ seconds to load (which is why I have it cached). On a new page load it's down to 0.1 seconds. Perfect.
However I come back the next day and the page is loading at 60+ seconds again. This would suggest that the cache is being cleared for some reason even though it's not set to expire for 1 year and no one has been in to the control panel to edit any content, which would bust the cache.
Has anyone experienced this issue, or can suggest any solutions.