Apache transfer speeds

hi all,

I'm having a weird issue. I have a server running Windows 2003, and
Apache 2.

I serve a 30MB file on Apache, and it takes over 1 minute to download
to my desktop.
If I copy it from the same server to the same desktop using file
sharing, it copies in 3-4 seconds.
If I use Jetty to serve it from the server to the desktop, it copies
in 3-4 seconds.
I tried swapping ports; so I put Apache on 8080 (to replicate the
Jetty environment) but my file still takes over a minute to download.

I run Ethereal, and I see that there are 0.5 sec "chunks" where Apache
isn't transferring any packets. It's like if it takes a 0.5 sec break
every once in a while.

Anyone care to comment? We looked at Apache configuration, TCP/IP
settings (registry, default Windows stuff) but nothing seems to be
wrong. There are obviously no anti-virus running either.

thanks for your help!