Performance regression in Web in 1.6.0

[mahozad]

Describe the problem After updating to compose multiplatform 1.6.0 and adjusting the code:

- Window(title = "App") {
+ CanvasBasedWindow(
+     title = "App",
+     canvasElementId = "content",
+     applyDefaultStyles = false,
+     requestResize = { IntSize(width = 900, height = 800) }
+ ) {

Icon(
-   painterResource("m$n-logo.png"),
+   painterResource(DrawableResource("m$n-logo.png")),

- @OptIn(ExperimentalResourceApi::class)
+ @OptIn(InternalResourceApi::class)
suspend fun loadResource(path: String): ByteArray {
-    return resource(path).readBytes()
+    return readResourceBytes(path)
}

- <canvas id="ComposeTarget" width="900" height="800">Loading</canvas>
+ <canvas id="content"></canvas>

the web app performance is much worse than what it was in 1.5.10.

Affected platforms

• Web (K/JS) - Canvas based API
• Web (K/Wasm) - Maybe

Versions

• Kotlin version: 1.9.22
• Compose Multiplatform version: 1.6.0
• OS: Windows 11
• browser: chrome 122
• JDK (for desktop issues): 17

Sample code See the source code here. And the live demo here.

Additional information I am facing this on a system that has no dedicated graphics card (so it uses CPU to render?).

[eymar]

Do you notice it only on a system without a dedicated GPU?

I see these errors in the console:

I'm wondering if there were the same errors with 1.5.1x versions? I couldn't quickly find a working commit with 1.5.x in your repo to try it.

Btw, on my laptop I don't notice any performance issues with your app (the wave runs smoothly and Ui is responsive. But it has a GPU.

[mahozad]

Hello. The performance is bad on Chrome in an Android phone as well.

I too see those errors in the console.

On that system tried to run jsBrowserRun with cmp 1.5.12, 1.5.10, 1.5.0 and kotlin 1.9.22, 1.9.10 and all failed with the below error: https://github.com/JetBrains/compose-multiplatform/issues/4003:

kotlin.NotImplementedError: Generation of stubs for class org.jetbrains.kotlin.ir.symbols.impl.IrValueParameterSymbolImpl is not supported yet

On my system performance is not as bad but it was better in previous versions.

[eymar]

Did you have the same app built with 1.5.1x versions? We would try to compare it with one built with 1.6.0.

The error:

kotlin.NotImplementedError: Generation of stubs for class org.jetbrains.kotlin.ir.symbols.impl.IrValueParameterSymbolImpl is not supported yet

It could mean there's a library incompatible with other libraries in your project. For example when you updated one library ("A") to a newer verision, but you also have another lib which depends on older version of "A".

[RafaelAthosPrime]

Maybe related to #4199 ?

[mahozad]

Did you have the same app built with 1.5.1x versions? We would try to compare it with one built with 1.6.0.

Yes. But now cannot change the versions back to 1.5.1x and test the app again because of the error #4003.

[okushnikov]

Please check the following ticket on YouTrack for follow-ups to this issue. GitHub issues will be closed in the coming weeks.