M1 and Big Sur. With great power comes great capability. M1 is the most powerful chip we’ve ever made. macOS Big Sur is the most advanced desktop operating system in the world. Combined, they take iMac to entirely new levels of performance, efficiency, and security. iMac wakes from sleep almost instantly, apps launch in a flash, and the whole system feels fluid, smooth, and snappy. With up to 85 percent faster CPU performance and up to two times faster graphics performance than standard 21.5-inch iMac models, you can use apps like Xcode and Affinity Photo to compile code in a fraction of the time or edit photos in real-time.4 And it runs cool and quiet even while tackling these intense workloads. That’s the power of hardware, software, and silicon — all designed together.