gistfile1.txt

@State private var fps: Double = 0
@State private var lastTimestamp: TimeInterval = 0
private let smoothingFactor: Double = 0.1

// ... 

.task {
    for await link in CADisplayLink.events() {
        updateFPS(link)
    }
}

// ...

private func updateFPS(_ link: CADisplayLink) {
    let currentTime = link.timestamp
    let elapsedTime = currentTime - lastTimestamp
    lastTimestamp = currentTime

    if elapsedTime > 0 {
        let newFPS = 1.0 / elapsedTime
        fps = (fps * (1 - smoothingFactor)) + (newFPS * smoothingFactor)
    }
}