Hopefully it will make our last gen Unibody white macbook (2.4Ghz C2D/320M/4GB) feel faster, Mountain Lion is pretty pudgy on it. Anyone running it on similar hardware and have similar feelings about Mountain Lion? Did it improve it much?
My older (2012) MBP ran Mountain Lion as an upgrade (had an i5 CPU - 2.5 Ghz), and it was ok. It only really slow up if I was doing a lot of things at once, or Time Machine wanted to do a back-up. That was until I removed it's mechanical drive and put in an SSD. Made a bigger improvement over any software enhancements, as it's biggest bottleneck was now removed. I had near instant power-on, and apps loaded almost instantly.
I can't wait for the new OS neither, but I don't see it drastically improving day to day performance on most machines for a typical workload - You're constrained by the physical hardware to a point, and I have already mentioned the biggest bottleneck component above (really consider taking it out!). I have keen interest on battery life enhancements Apple are touting, and improvements to Keychain. If that's as good as they hype up then Mavericks could be a home run - It could maybe squeeze an extra hour or two out my new MBP to get a solid 12+ hours runtime on a charge.
I just hope they have not filled it with some of the UI enhancements that iOS 7 has seen. I'm not it's biggest fan after the updates...
Mega Beast - Intel i7 4790K | Gigabyte Z97X-UD3H-BK | 16GB DDR3 | SLI GTX 970 | Samsung 850 Evo 1TB
Mini Beast - Intel C2E QX9770 | Gigabyte X48T-DQ6 | 16GB DDR3 | KFA2 LP GTX 750Ti | Seagate 2TB SSHD