Bigpants
In simple terms, and if you're in my sector, I just want a bit more climb/descent from you.....I know you can give me something for a short duration by height/speed trade-off and that's what I expect. I am concious that "expedite" will have different values for each type and will depend on your weight. I don't ask unless it is necessary and you can always decline if unable or unwilling. I would add that there is nearly always a benefit for you in complying......we just want to get you to where you're going with the least hassle. Worked Concorde for years and she could do the most awesome zoom-climb on the rare occassion it was required....particularly between CPT and MALBY to get through the subsonic stuff.