My experience with NA Central Rockies...
Started out at 4.75 Mb/s, lasted about 5 mins, then a rapid decent (no speed brakes) over the next 30 mins to a crawling 258 Kb/s.
That was pretty painful for 2.6Gb D/L !!!
PS: My broadband HFC D/L speed test is ~47.7 Mb/s+, so what's up with the ORBX server?