I as a pilot see my colleagues utilise different ways af complying with the instruction to expidite. The one pilot increases his rate of climb with e.g. 1000 fpm thus only trading in speed at a slow rate. The next pilot selects MAX rate climb speed (not BEST rate) and his speeds drops quickly while increasing ROC with 3000fpm or more (and maybe 1000fpm was enough to do the job).
English is not my first language, but if I can trust my dictionary the word expedite means something like 'speed up' and not 'speed up as much as possible'. Correct me if I'm wrong here, but if I'm right the term 'expedite' is far from unambiguous.
I understand just saying expedite makes life a lot easier for controllers but wouldn't it be better practise to instruct to 'climb with minimum 2000fpm' or 'be level in 3 minutes'.
Greetings Z.