WordPress Cache Plugin will creates static html files from your dynamic WordPress blog. When a page is rendered, php and mysql are used. Therefore, system needs RAM and CPU. If many visitors come to a site, system uses lots of RAM and CPU so page is rendered so slowly. In this case, you need a cache system not to render page again and again. Cache system generates a static html file and saves. Other users reach to static html page.
Download links:
https://www.mirrored.to/files/EF4A41D7/wpfast.zip_links
https://filekite.com/e430082e2569a8dc/wpfast.zip