If your using this blade, you have a light duty saw So don't expect miracles.  Mine is an echo CS-400 with an 18" bar. For $15 you get a brand new fresh blade that cuts straight and can keep up with the motor. Once the blade hits the dirt or a rock a few times it gets harder to keep it fresh with a file and if you're like me, I end up sharpening one side better than the other so the cuts start to turn. Easier to just replace the chain! Keep a spare on hand.