rjq1995 seems strange that this would make any difference
It's because it's multistream. Best is to use a download manager, they are equipped to deal with this and increases speed greatly in most cases. jDownloader and Ninja Download Manager are not compatible with our website.
In short, the standard browser download is getting overloaded with packets that don't belong together and then writes incomplete chunks to the storage device. It's somewhat comparable to how torrent downloads work.