A few of you may know that I generally speak favorably of Yosemite... While it hasn't changed (meaning I kinda like it - and I "got used" to the UI) earlier this week I experienced a major crash with Pro Tools at work (not related to Yosemite), which has subsequently rendered the application unusable. On a side note, I'm a musician working mostly in film music, so using Pro Tools and audio apps in not a hobby for me, I need them to work, to be stable and reliable as I make my living with them. Pro Tools was so painful to use that I had no choice but to backup all my important stuff on the internal drive and do a clean install of OS X, then reinstall all my audio apps (fortunately my samples and audio libraries are on other drives otherwise it would take ages to install everything again).
As I'm still not sure where the problem came from, I've decided to not only start fresh, but also start "safe". So I chose to install Mavericks instead.
...Well...
It feels better. It feels better that Lucida Grande is back, feels better that the Finder is much faster than Yosemite's (system prefs open instantly, lists appear instantly, no lag whatsoever, etc), feels better that I don't have to reduce transparency to gain 5-10% of cpu or to simply have readable menus. I was thinking I would see how it goes and go from 10.9 to 10.10 again on this machine (Mac Pro 12 cores mid-2012), but after 2 hours in 10.9 (currently updating to 10.9.5 and installing all my applications, I think I'll just stay in 10.9.5 for the time being. Since this morning I've witnessed pretty clearly that Mavericks performance is much, much better than 10.10 with all its (unnecessary) bells & whistles. Plus, my Mac is not my iPhone, I don't need to make calls from my computer, I don't need icould drive, you get the idea...
I do like 10.10, in fact I installed 10.10.2 yesterday on my Mac Pro 1,1 with no trouble, it works fine, it's stable, but I don't want a slow OS, I don't want to deactivate some functions to make it better. And I still find it too bright.
I know I often come to this thread to say that Yosemite is not as bad as people say, well while I do think it is indeed more than tolerable, today I have to admit I'm glad I'm back to Mavericks (maybe I'll downgrade my other Mac Pro as well). When Apple released Yosemite a few months ago, I thought it was better to keep up with the most current OS. It seemed at least as good as Mavericks in terms of speed so I figured well let's just get used to this new look, no big deal, and frankly I've never experienced any major issue with 10.10 (so far). I don't know if I was fooling myself regarding Yosemite's performance or if I'm just having a nostalgia moment, but 10.9.5 is now my home. Again.
Very well said.