Performance issues with FTP uploads to remote server?

[eluser]CroNiX[/eluser]
We run apache for the main site and serve the images from a subdomain on the same server, which runs on NGINX server whose sole purpose for us is to serve images. No html or php or anything else. Browsers are usually limited to, I forget the number, but its something like loading 4 or 5 files from a single domain simultaneously. So if you use one domain to do the main site and a separate domain (or subdomain) to serve images, you can get quite a speed increase in the time it takes a website to popup in a browser, because you can load that many more resources simultaneously.