Judge speed (4)
I believe the answer is:
rate
I believe this is a double definition.
'judge' is the first definition.
(rating is a kind of judging)
'speed' is the second definition.
(rate is a kind of speed)
(Other definitions for rate that I've seen before include "Assess; speed" , "Estimate value of - speed" , "Assess; scold" , "Appreciate" , "Assign a value to, appraise" .)