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I found my Magit was particularly slow on my OSX Aquamacs instance, and then learned that it was a known performance regression that apparently stemmed from Aquamacs not using vfork on OSX. A one-character source edit and a rebuild, and my Magit was pretty zippy again.

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Emacs in particular, and a lot of Unix software in general, run very poorly in Mac OS X compared to Linux or OpenBSD. I had to look up what vfork was, and learned that it was deprecated in POSIX 2008. Not surprising. Mac OS X seems to be in perpetual beta mode, where it is always half-way behind on basic Unix features, and the other half are proprietary interfaces that get deprecated/broken/incompatible changes every major release. Switch to a better operating system.

”Switch to a better operating system”

Even if better Operating Systems exists, there are no better Deskop Environments ;-)

I wouldn't consider a desktop environment that forces one to put up with useless transition animations even a good desktop enviroment.

That doesn’t bother me but to each their own.

I agree, there is no better desktop environment than Emacs: https://github.com/ch11ng/exwm

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