This section gives you control over how caching works within your store
Leave Page Caching set to On to have your store pages load faster. It means that instead of calling the Amazon servers with each request, pages are requested once and then stored (cached) on your server for future visitors for a period of 24 hours (default). Once the Cache Lifetime (below) number of hours passes, a new version of the page is loaded with the next visit and cached for another Cache Lifetime number of hours.
This is the number of hours your pages will be cached before they expire. Once expired, a new version of the page is loaded with the next visit and cached for this many hours.
Page Caching requires server storage space. This settings ensures that old cached pages are cleaned from your server automatically and don't use up this valuable space. Setting this value to 20 means there is a 1 in 20 chance cache files older than the Cache Lifetime (24 hours is the default) will be cleared. Setting this value higher means your cache will be cleared less often which can improve performance at the cost of higher disk space usage. Setting this value lower means your cache will be cleared more frequently which will leave more disk space available at the cost of performance. We recommend the default of 20. Set higher or lower depending on your store traffic and storage limits.
By default all cached files are stored in the /aom/cache directory. If you would like cached files to be placed in subdirectories based on the cache ID, set this to Yes. These subdirectories go two levels deep.
If Page Caching is On and you are using your own Site Header, setting this to No will cause your header file to load with each page load while the store content will pull from cache. Warning: If set to No, no variables are passed into your Site Header file meaning page titles and meta tags will not change based on the store page.
If Page Caching is On and you are using your own Site Footer, setting this to No will cause your footer file to load with each page load while the store content will pull from cache. Warning: If set to No, no variables are passed into your Site Footer file.
If set to Yes and RSS and Page Caching are enabled, your store RSS feed pages will be cached for faster page loading.