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If you have our Magento Full Page Cache Extension (or a 3rd party full page cache solution), then you need the Magento Cache Warmer / Crawler. The Magento Cache Warmer crawls your Web site to ensure that pages are always preemptively cached and at their fastest. It crawls your Web site with concurrent requests for the fastest crawls possible. Your old cached pages will automatically be refreshed by the crawler to ensure visitors see the most recent version of your site as possible. Cache Warmer / Crawler uses special techniques to reduce bandwidth and reduce CPU usage. If you want to ensure as much as your site is cached as possible, then this is the extension for you.
What type of stores benefit from the Magento Cache Warmer?
Any store that wants to improve its cache hit rate. Cache hit rate is the number of requests to your site that are uncached versus cached. The higher the hit rate, the faster your site. You may have the fastest cache solution in the world, but if your cache hit rate is low, then your store will still be slow. Stores with a high number of unique pages compared to their traffic will tend to have a low hit rate and as a result caching solutions are not effective. The Magento Cache Crawler solves this by crawling and pre-caching the pages on your site, which will increase the cache hit rate. The end result is an overall faster site.