Thanks for posting this . I have seen PF vids testing other things but missed this one . He just confirmed what I suspected for years . Carlton makes a good chain but it is slow compared to Oregon or Sthil and it has always been a hard chain to sharpen for me and I could never get that Carlton chain to cut as fast as Sthil chain or some of this new Oregon chain.
P Farm did a very nice job with this video . I especially liked the closeup shots of the cutter profile and the underside of the top plate and the view of the side plate showing the differences in the manufacturing of mass produced chains.
I particularly like that PF refuses all sponsorships, everything he tests he buys himself. Nothing "provided for free as a tester" by a manufacturer. AvE does the same thing, quite the credibility booster.