Made more efficient (11)
I believe the answer is:
streamlined
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">made more efficient</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for streamlined that I've seen before include "Aerodynamic" , "Designed to reduce wind resistance" , "Designed for smooth flow" , "Shaped for speed" , "Shaped for smooth flow" .)