Assuming the most performance intensive tasks most users do is browse the web, it's probably a win. Webkit's garbage collector is conservative-- it scans all me

Assuming the most performance intensive tasks most users do is browse the web, it's probably a win. Webkit's garbage collector is conservative-- it scans all memory looking for possible pointers-- so it runs more efficiently on 64-bit architectures where valid pointers are unlikely to randomly occur. Lots of JIT tricks like tagged pointers really work best on 64-bit architectures. https://webkit.org/blog/7122/introducing-riptide-webkits-retreating-wavefront-concurrent-garbage-collector/ https://webkit.org/blog/7122/introducing-riptide-webkits-ret... It's not just extra registers and address space. ARM64 is a large-scale restructuring to better enable modern processor design, including things like removing barrel shifting on every instruction (expensive and not very useful) and removing predication on every instruction (expensive and makes OoO machinery slower). http://stackoverflow.com/a/26841196 http://stackoverflow.com/a/26841196