Chainsaw Repair

 I have timed the Oregon square grind and the stihl round ground on the same saw with the same bar in the same 10'' log and the stihl round ground was a good bit faster. Oregon square ground lately has not been up to par IMO. Stihl square ground is sharper out of the box than either mentioned. I would start with that and a good muffler mod and well tuned saw.