All I know is that every game I've played where there are dedis I do not experience lag that is bad enough to cause me to rage quit. 99.9% of the time I've ever quit a match has been because of lag. I've never quit a Battlefield match because of lag. When there has been lag on Battlefield, you can hear everyone complaining about it at the same time. And it wasn't more then a week later that the lag would be dealt with because the changes to fix the lag were made on the dedis. Which also meant there was never a patch to download. The developer fixed it, and you would instantly see the improvement.
So, yes, dedis would bring about an improvement in lag comp experiences I would bet.