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I guess that battery life is a bit longer but i had not done any special tests
 
how come the memory stuff is a lot better on ML?

In Activity Monitor seems that memory management is more agressive, so I believe it could be better, but we will see. I did not test a long time Safari web browsing with many tabs which is a significant problem in Lion.

The most significant improvement is a Safari 5.2 - faster than 5.1.5 and there is no need to use additional search bar. But I hope that Lion will get also a new Safari as an update.

Updates are now through AppStore Updates which is funny because in Lion there is a place for it, but not used in the same way like in ML. Do not expect much.

I did not test more features, but it seems that ML release is mainly because Apple must to adopt OS icons to new products with Retina display.

Anyway forget about benchmarks I do not recommend to use ML DP2 as a standard day to day OS. Wait for a ML final release. Still there are visible issues: (graphic artifacts) during boot and desktop use, animations are not smooth. Currently Lion seems much better choice even if not perfect.

P.S. Tested on MBP 4.1 Early 2008
 
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I'm pretty sure that my MacBook Pro's Geekbench score is higher on Mountain Lion than Lion as well. Its current score is 6709 and I don't think it was ever over 6600 before.
 
I'm getting about 160 more points on Mountain Lion in GeekBench as well, 9987. In fact, it might even be more since I'm comparing to a machine with more RAM (same spec otherwise)
 
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