[CentOS] apache slow on lan transfers?

When I download a file from apache on the lan (gigabit lan), I only get 3-4mbps of download speed, opposed to accessing the file via FTP or SMB which results in 500+ mbps of transfer speed. As far as I know, I'm running the stock apache (httpd) that is distributed with centos 5.3, and haven't changed anything in the config file with the exception of setting up various virtual directories.

I'm hoping someone can give me pointers on what I need to search for to research this problem. Apache + slow + lan isn't really getting me anywhere. The apache process itself on the server doesn't even register 1% of cpu usage, and iowait is 0%

All suggestions are appreciated,

Gordon