CoreGraphics Engine: 60 FPS
Crown: 0°
Modern watchOS faces render complications via WidgetKit SwiftUI timelines. Entries provide timeline dates, allowing the operating system to pre-render states with zero runtime battery penalty until timeline refresh points occur.
In dimmed wrist-down state, watchOS enforces a strict 1-hertz update ceiling for seconds and limits full-screen luminance to less than 15% subpixel coverage to safeguard OLED degradation and battery reserves.
Sensors such as PPG heart rate and accelerometer cadence run under dedicated coprocessors. Updating UI graphic meters at 60 FPS is exclusively reserved for ongoing active Workout sessions; standard faces throttle to 1-minute intervals.