When I switched from the iPhone 6s to the 8+ I though it would feel so much snappier, since its benchmarks were so impressive. But frankly it doesn't feel that much faster as the score difference between the A9 and the A11 suggested (6s 2227 vs 8+ 4216 Geekbench).Can't wait to see the benchmarks for A12X for the iPP, it's going to be a beast!
Idk if iOS 11 isn't optimised enough to take full advantage of the hardware or if those benchmarks simply don't say much about the actual performance in day-to-day usage scenarios.