CentOS Web Server is very slow

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http://serverfault.com – I have a local Web Server (running CentOS 5.5) that hosts an intranet for my company. The server itself runs fine, and the web pages are servered, but it is very, very slow. I find myselft having to restart the httpd service at least once a day to try and get some sort of reasonable speed. On the home page for example, I have 11 requests, whcih firebug tells me took 406ms, yet the 'onload' that it specifies is 6.47s. Indeed, looking at all of the requests, I can see that the first was not served until after +4.9s (Request start time since the beginning). Being fairly new to web servers, I ha (HowTos)