It never fails that the subject of speed of mowing comes up on Lawnsite.com and then the quality of cut comes up. Some say you can't cut at high speeds except when it is thin grass. I knew this subject would come up again this winter, so I took a picture at the level of the cut of grass on a lawn that is very very thick and I was taking off about 3 or 4" and going at full speed (12 MPH)in this area that I took this picture. To do this, you have to keep sharp blades on the mowers, I'm talking every day, not once or twice a week. I'm sure some of you will find flaws in the below picture, but it is an exceptable cut for the conditions.