My iPhone 15 Pro Max now scores 200-300 lower points on Geekbench 6 on iOS 18 and 18.1 beta compared to iOS 17. Apple claims better battery life by adjusting CPU ramp up speed on iPhone 14 and 15 Pro models. But I believe that this is done specifically to show 16 models as better performers. Never seen an iPhone CPU getting a permanent nerf like this. My battery life has been as pathetic as it had been before on iOS 17. My phone battery health is still 98% with 150 cycles.