I'm having the same problem mentioned in another post in this group titled

Apache throughput on high latency links WAN

Basically, downloading from an Apache webserver is about 4-5 slower than
downloading from an IIS box sitting right next to it. Apparently the default
TCP send buffer for Apache is 4096 bytes. I want to increase that value so
I'm using the SendBufferSize directive. I've tried setting it to 65535,
32768, and 0 (which should use the system value). So far, no matter what I
use for the SendBufferSize value, Apache seems to use a value od 4096 bytes
anyway. I've run network traces to verify this behavior.

Any ideas why this would be happening? Is there any known issues with
SendBufferSize not working properly on Win2K?

My config is:
Apache 2.0.44
Windows 2000 Pro SP4