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That's a very small part of it. I just hate the new look in some places, like the color-changing Safari toolbar, and it's just useless and annoying to me. Maybe 'completely unusable' was a bit of an exaggeration…YMMV.

Just curious, why would you love transparency? IMO it’s distracting at best and crashy at worst.

Karabiner is amazing. I love that I can finally recommend it to people and they don't say "I have an iMac…"

Yosemite is completely unusable without Reduce Transparency on IMO.

Glad I'm not the only one. It's not nearly as bad as my 2007 on 10.6.8 though.

Same here, on a 2012 Air. Performance is great but I've noticed a couple Safari crashes/freezes. Finder crashed once I think. Also had trouble with Dark Mode+Reduce Transparency, but those are just beta issues and since GM1 the only issue has been the weird black corners of the volume popup.