I recently moved from a Fibre connection to a standard broadband line. Speed is currently a superb speen of 1.3 mb down and .3 up.
Years ago when I has on a broadband connection I was able to tweak the noise ration and achieve a speed increase from .6 to just over 1.2 mb.
Every last ounce sqeezed out would be useful but I cant remember what the software was. I know it seemed to be in german ofr some similar language.
Still awaiting a fibre connection in 18 months!