On our quest to offer the best possible hosting solution for large-scale Drupal sites here at Acquia, we recently added support for memcache to our Acquia Hosting platform.
For those that don't know memcache, it is a high-performance memory object caching system. Oftentimes it's used to speed up database-driven websites by caching data and objects in RAM. This is very effective in managing the load on your database, which for most web applications including Drupal, is the biggest performance bottleneck and risk to scalability.
Memcache is a natural addition to Acquia Hosting. The Memcache module for Drupal was originally written by Acquia's Robert Douglass, and continues to be maintained with Acquia's help. So it only makes sense for us to add support memcahe as a hosting option. Combined with all of the other high-performance and scalability features (e.g. Varnish, NginX, etc), it makes Acquia Hosting a very powerful offering.
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