Memcache is used on your server to cache data that you would normally request from the slower main database (probably MySQL). If you have a lot of video conten

Memcache is used on your server to cache data that you would normally request from the slower main database (probably MySQL). If you have a lot of video content, investigate a content delivery network. They host your large files in various locations around the world and send them to end users much more quickly than your server can. I generally use Softlayer's CDN, but Amazon and many others have good offerings.