Go2Linux posted a guide about creating a RAM disk to improve performance of webserver

These days, RAM is not as expensive as it use to be, therefore almost anyone can afford to have a lot more memory that he / she really needs. If you have more memory that your system usually needs you can give it a really good use. As everybody knows, RAM is faster, way faster than hard disks, then, why not use RAM to perform actions that require a lot of disk I/O tasks.

  Create a RAM disk to improve performance of webserver