So, I recorded two videos on Android and IOS that ...

# compose-ios

[Henri Gourvest]

So, I recorded two videos on Android and IOS that show the difference in motion rendering. The frame rate seems to be lower on IOS, while the other applications are perfectly fluid. I know that Compose IOS is in Alpha, but I'd like to know if this is a problem that's considered important or not. Because for the type of application I want to develop, it's crucial.

RPReplay_Final1697797162.MP4Screen_recording_20231020_121140.mp4

[Ivan Matkov]

Thanks for looking at it! Could you please send a report with reproduction sample here?
https://kotlinlang.slack.com/archives/C0346LWVBJ4/p1691063974417639

[Henri Gourvest]

I've created a component that eats frames to count them. This had the effect of masking my problem and making the application run perfectly smoothly. Unfortunately, I can't share my code as it is, so I'll try to remove as much code as I can until I completely understand the problem.

@Composable
fun EatFrames() {
    var count by mutableStateOf(0)
    var mark by mutableStateOf(TimeSource.Monotonic.markNow())
    var rate by mutableStateOf(0)
    val textMeasurer = rememberTextMeasurer()
    val precision = 120
    Canvas(Modifier.width(32.dp).height(24.dp).background(Color.Green)) {
        if (count == precision) {
            rate = (1000 * precision / mark.elapsedNow().toLong(DurationUnit.MILLISECONDS)).toInt()
            count = 0
            mark = TimeSource.Monotonic.markNow()
        } else
            count++
        drawText(textMeasurer = textMeasurer, text = "$rate")
    }
}

[Henri Gourvest]

I managed to isolate the problem
https://github.com/JetBrains/compose-multiplatform/issues/3847