具体是怎么进行优化的，我不是很清楚，直接放代码，已经测试，PHP速度明显变快了很多，负载也降下来了。

hostnamelookups off
options -followsymlinks
options -indexes
#allowoverride none
timeout 5
keepalive on
maxkeepaliverequests 500
keepalivetimeout 5
serversignature off
StartServers 20
MaxClients 800
servertokens prod

httpd.conf

具体含义可以参考:http://www.myhack58.com/Article/sort099/sort0100/2011/32655.htm