Apache Download slow

Hi guys,

i have a apache server and the downloadspeed in the intranet is about 7 MB/s. When i copy files via samba (same server) its about 600mbit/s. So what it slowing down my apache? Its not the CPU (apache use about 5.7%) its obviously not the HDD neither is it the network. So how to speed it up? I tried moving it into a ramdisk but that didn't helped.

greetings from germany