I had the same issue. I began my Fileplanet download around 9a last night, went to bed. Got back on my computer this morning at 8a....download was at 7%! WTF!
So, I stopped the download and clicked the 'Download Maxium Speed' button again. It found another mirror and now its blazing at 300kb/sec consistently!
I will be late for open beta, but at least I'm at 10% download in 40 minutes right now vs 7% in 11 hours this morning!
So, you may want to simply stop that download and ask the 'button' to find a better mirror. You'll see right away if the new mirror works better by noticing if the blue meter remains consistent vs. going up and down like a roller coaster.
Hope this helps...at this point you're going to be late for open bate anyway it goes. The question now is, late by how much?