Absurdly slow download speeds

[Jeffrey Rosen <jeff at applekore dot net>]

I'm trying to implement file transfer over TCP/IP in my app and I've run
into a brick wall.  The downloads are snail slow, say 10k/sec (locally.)
What's interesting is that as soon as I start moving my mouse around, they
pick up the pace - they zoom up to 300k/sec or so (still really slow, but
adequate.)  When I keep my mouse idle, they drop down to the 10k/sec speed
again.

Any ideas?  And btw, does anyone have any suggestions for prebuilt sockets
to use?  I'm currently using FileSocket 4.  Has anyone had any good
experiences with other classes?

- Jeff