The oak was hard but it cut easier. I think it was a two fold problem. The pine seemed to have sand embedded in it and the pitch was a problem in gumming up the blade even using the soap lubricant. The changing of blades is a big deal to me at 20 bucks a blade also. Piece by piece the pine might cut faster but when I figured in blade changing and cleaning the oak went better. Yea, my oak is extremely hard too, I have to shoot the nails through it. A hammer is worthless...almost.