That depends on how slow the download is going as a single threaded action, & how urgently you need the file. Plus MD's queing function & the fact that with the right settings it will keep trying to get the file until it gets it [for example if you keep losing connection to the server @ the other end], without having to start again from the beginning [well, that works on 99% of servers - some block resuming, in which case it would have to start over].