Just found this very good article about optimizing servers.
Optimization
Set the number of reserved filesystem blocks of a disk
The default value of “Reserved block count” takes 5% of usable disk. On a large fs like 813G, it represents about 40G. These blocks are reserved to the super user to recover from situations where user processes fill up filesystems. It is absolutely safe to reduce this space to one hundred or so MB. check …
permanently load enable HTTP Accept Filter FreeBSD kernel module (accf_http)
While reading articles about optimization, I read about the accf_http module. The man page of the module is here, where you can read: The utility of accf_http is such that a server will not have to context switch several times before performing the initial parsing of the request. To load this module, use the following …