Mavericks Beta 4 Performance
I ran sun spider, JSBench and Geek bench. Compared to Beta 2 there are huge performance gains. Take a look at my old posts for that data.

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Mavericks Beta 4 Performance
I ran sun spider, JSBench and Geek bench. Compared to Beta 2 there are huge performance gains. Take a look at my old posts for that data.
ios7 beta 2 performance iphone 5
J2bench, sunspider, linpack, and geek bench. I'm seeing marginal performance boost in non-java and pretty significant in java. Original benchmarks here -> http://illmaticwes.tumblr.com/post/52912710982/jsbench-ios7-comparisons
Safari 7 J2Bench Results
17ms vs 53 ms
195.8 vs 303
Significant improvements in both benchmarks for safari 7 vs safari 6