@unknownuser said:
If that is what you are doing......try selecting the trim tool before selecting any entities.....click 1st on "the box" and second on the first sheet(it will trim)....the "box"(first selection) will remain selected so just click on second sheeet(it will also trim)....click on third sheet.....and so on.
Should be aproximately a 50% time saver. π
More than 50% for now, since I rearranged my toolbars with the 2014 update, so all the less-used functions (less used than the pencil and eraser, at least) now have a built in "oops, it's over there now" delay.