According to the Apple website: "The apps in iOS 9 now take advantage of Metal, making more efficient use of the CPU and GPU to deliver faster scrolling, smoother animation, and better overall performance. Email, messages, web pages, and PDFs render faster. And multitasking features on iPad feel fluid and natural." Since Metal is only supported on 64-bit devices, wouldn't this mean that users of 32-bit devices (myself included) should NOT expect performance improvements going from 8.x to 9.x? I'm currently on iOS 6 on my iPhone 4S and have been heavily itching to update to iOS 9.1, but I'm hoping I can take advantage of some sort of performance improvement. Before you try to tell me to stay on iOS 6, let me say that it's not a screamer of an OS like people like to make it seem. It's outdated both visually and functionally, and I can't even update to the latest versions of apps that I like to use. I much prefer the interface of iOS 7+ compared to 6 and before as well. If someone could clarify, that would be great. Thank you.