Another thing to consider is the difference in the manner in which these saws are meant to cut. The 056 is a torque monster that is designed to grunt it's way through the wood, whereas the 460 is a higher revving saw, intended to be allowed to cut through wood on it's own at a higher chain speed.
Absolutely. Carvinmark said he was down on power, though.
If the saw is slowing in the cut it is probably off tune.
If it doesn't slow and the chips coming off look good, but it is not cutting as fast as hoped it may be worth checking RPM. Assuming this is OK the next thing to do is replace the 7 tooth sprocket with an 8 which my math tells me should cut about 13% faster. However in this case with such a long bar it doesn't sound like the case. I have an 8 tooth sprocket on the 045 with a 20" bar and a 7 on the 056 Super with a 25" bar. Perhaps someone could suggest an optimum bar length to make the change in easy and difficult timbers.
I don't have experience of cutting that particular wood with such a long bar so will get out now before I'm in too deep.
Big feller.