The only way for you to cut faster is to get a bigger saw. That's how I ended up having 4 Stihls. Well 3, I can't let my daughter know I call the little saw mine when I bought it for her, lol. a 16 inch bar will be very slightly faster than an 18 cause of the shorter chain being lighter but you won't notice it in cutting speed. sharpness is a factor too, a good sharp chain will cut faster.