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According to https://www.anandtech.com/show/13392/the-iphone-xs-xs-max-re... reason is new memory subsystem. The new chip is not just fast at Speedometer 2 but %40 faster almost all at other benchmarks. Also, all iPhone devices are fast with iOS 12 JavascriptCore.

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Per https://images.anandtech.com/doci/13392/SPEC2006-eff_575px.p...

SPECint2006 -- 36.93 --> 44.92 is about 20% better

Speedometer2 -- 90 --> 125 is 38% better

That is nearly 2x what SPECint would predict. (It's also not changes in Mobile Safari / iOS 12 because every device benchmarked was on the same version of iOS 12).

It's not 40% faster at "almost all other benchmarks". In Geekbench 4 single core, it's about 15% faster, and in many other benchmarks about the same. That's why the official guidance from Apple is that the XS should be 15% faster. Having seen the other low level benchmarks, I was really surprised when I saw the Speedometer results..

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