So I am thinking about age. Mine in particular. I just had my left knee totally replaced. So here is my question. What is more important to you as a saw operator. Cutting speed or the size of the chips from the cut. Mine is the size of the chips. This tells me that the chain is doing the job meaning that I have done mine. I can wait another second or two but I have viewed others that appear to be throwing saw dust but are still making the cut. Yes there are many variables here. Anyway just something that I wood toss out and see if it wood stick. Ken