Fileplanet unfortunately kind of shafts non-paying users on the speed end of things. You can try the torrent downloader, but bittorrent can also be unpredictable speed-wise (also you would have to start over).
As of a couple hours ago I was helping a friend get the torrent up and going because of the same issue for him with FP.
There was a few hundred seeds and nearly 10k peers at that point. Last I talked to him he was running 150-300k or so.
With those many clients up, you should in theory max your download speed if you throttle your upload appropriately. Most unbalanced home .net connections don't handle multiple traffic sources well, you can thank your ISP for that...its not just the bandwidth of your upstream.
I've been downloading for most of the night - when I wake up it's at 40.00 KB estimated another 7 hours to finish. WTF? Before I went to sleep it was at 400.00 KB (midnight GMT time).
(Living in UK so using the international one annoyingly. Would have thought they would seperate it further.)
*EDIT: Make that 20.00 KB at times making the estimated time to about 5/6 PM my time - so will have taken me 18 hours to download. Jesus even my WoW Patchs didn't that long. How bad is it going to be on patch days?!*
am currently downlaoding using torrent, fileplanet did not even start it stays stuck at preparing downlaod for 40 minutes now. its aroudn 150 kb/s at this time. But drops to 10kb/s aevery now and then. (20mb line)