I am trying to rip tenons (first time ever hand saw ripping) on the legs of my poplar roubo bench. I thought I could get by using a crosscut saw, and it was painfully slow. So I went to Woodcraft and bought a Putsch 7 tpi rip saw. Unfortunately its not really any better than the crosscut saw. Do these need to be sharpened before use? I realize that I didn't buy a premium saw, but I expected it to work better than the crosscut saw.