Outhaul Rigging / Necessity

I've sailed my FS for many years without an adjustment to my outhaul.  I am daysailor, but love to make my boat go fast and as efficient as possible.

In the past, I've always just tied the clue as far aft as I can and left all season ( I'm at a mooring )

But, I was playing with the idea of adding an internal outhaul adjuster.

I know every adjustment can make the boat go a little faster, all the parts adding up to making the boat as a whole - Faster.

But, how important is this adjustment ?  I don't have a cunningham either :)