You can now enable / disable cache memory

A web cache is a mechanism for the temporary storage (caching) of web documents, such as HTML pages and images, to reduce bandwidth usage, server load, and perceived lag. A web cache stores copies of documents passing through it; subsequent requests may be satisfied from the cache if certain conditions are met.

Why?
Disk cache is now included to speed up your site even more... Comes in handy when you've many visitors on your site, while you don't update your website on a regular basis.