IMac, slower FTP uploads than XP machine on same network

Question

I had previously been working on a Dell desktop, and a major part of my job is uploading 3-5GB files via FTP to another server. I used Filezilla for the most part.
I recently bought an iMac, and installed the same program, Filezilla, the OSX version, and proceeded to upload one of these files. I noticed that after a little bit, it was getting 35-43 kbps.
My XP computer is still plugged in to the same router, so I tried uploading the same file to the same FTP server, via the same program, and got 75-90 kbps uploading time. Obviously, that's twice as fast, and therefore an upload that would take 24 hours on my old machine, takes 2 days on my new machine. Same ISP, same router, etc. I did a speed test on both machines, and 768 kbps upload responses on both.
Is there anything I can do about this? I have roadrunner cable broadband in New York City, if that helps. I couldn't find DNS information for it, to plug into my ethernet settings, but I did change them from automatic to manual, according to some posts I saw regarding this specific problem, which others have experienced. I'm not all that savvy about router settings, which, as I said, worked much better with XP.
Any ideas? Thank you.

Answer 1

You might try another FTP program, such as Fetch, to see if the Mozilla program is slow on Mac OS X for some reason.
http://fetchsoftworks.com/
(15-day trial)
or another one
http://www.apple.com/downloads/macosx/internet_utilities/classicftpformac.html