FpsCounter.kt

@Composable
fun FpsCounter(
    modifier: Modifier = Modifier,
) {
    var fps by remember {
        mutableStateOf("")
    }
    LaunchedEffect(Unit) {
        val frames = mutableListOf<Long>()
        while (true) {
            val frame = awaitFrame()
            frames.add(frame)
            frames.removeIf { frame - it > 1_000_000_000 }
            if (frames.count() > 1) {
                fps = (frames.count() / ((frames.last() - frames.first()).toFloat() / 1_000_000_000f)).roundToInt()
                    .toString()
            }
        }
    }
    Text(
        fps,
        color = Color.Black,
        modifier = modifier
    )
}