Many of you are saying that if you can do high speed, why not? It's more efficient. Well not if you've planned on 250/10000ft in the box surely? The box plans an idle decent, so if you've implemented slowing to 250kts at 10,000ft, it will do so with idle thrust then continue at idle at that speed until configuring. As soon as you erase that 250kts below 10,000ft out the box, you're low on the profile and at some point will need thrust to regain that profile whereas before you'd spend that time at idle.
I don't understand people who will willingly do 320kts below 10k...it sure isn't ECON speed with todays fuel prices, and I very much doubt it's in any company SOP though I do seem to here it an awful lot from the same operator...