CentOS - Increasing Users Download & Upload Speeds

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http://serverfault.com – I have has some clients report that their download speed from my web and ftp servers max out at 4.5Mbps for them, to me thats awesome, but now i am wondering why it stop at 4.5. The services are separate service runnning on the server. When i test my speeds from speedtest.net it shows as 30 Mbps - Down 20.5 Mbps - Up Apache is the web service running VSFTP is the FTP service running, i checked the conf and the limit bandwidth is commented out. The server has dual Gig NICs OS: CentOS 6.2 CPU does not spike much at all and memory usage is very low. Tomorrow i will test a download from an (HowTos)