[Yoshino]

I do agree that Yosemite has had some performance regressions, but people seem to remember the older operating systems with rose colored glasses. I used 10.3 to 10.5 on the 2005 PowerBook G4 (1.67 GHz) and it was incredibly slow. Spotlight was nearly useless. The fans would frequently spin up. And let's not talk about Finder locking up when a network mount disappeared. Right now I use 10.10 on the original 2012 Retina MBP, and even though Yosemite is a bit slower than Mavericks it is still leagues faster than (Mountain) Lion on the same machine (which is what it shipped with). The biggest performance regressions I've seen have been in Safari, but Chrome doesn't seem to have the same problems.

I think they are paying attention, since 10.10 performance has improved considerably since the first DP, but they need to do more. I wish they would stop fucking with it on a yearly cycle and just release a stable, fast operating system with no new features. The graphics system needs more optimization and they need to kill HFS+ (but that's a whole different can of worms).

(Edits: wording)