TwinColselect.setItem is taking too much time

[madhu1830]

TwinColselect.setItem is taking too much time

[TatuLund]

Thank you so much . is it version 3.0.1 or 3.1.0?

3.1.0

[TatuLund]

Yes, it is easy to replicate. I also tested Vaadin 14, which is much faster as well, probably no difference to Vaadin 23. So there is definitely something odd with Vaadin 24. The code between Vaadin 23 and 24 versions are 99% the same, so this makes it very odd. I did time benchmarking of the internal reset method, and that is not the bottleneck. I run also the Chrome dev tools profiler, and that reveals that time is burnt when items are rendered. Particularly there is one function in Flow client taking much time time, but the name is obfuscated, so I do not know what it is.

[madhu1830]

Agree , i had also seen the network calls where flow client function is running and it's taking too much time . But if we run the same functionality for 300 data items then it's working perfectly fine .
Also, is there any way to get all the Items from TwincolSelect so that we can append the items asynchronously in the Twincolselect because setItem overrides the Item (Not append them ) and there is not method named as getItems which is fetching the items from the TwincolSelect itself

[TatuLund]

and there is not method named as getItems which is fetching the items from the TwincolSelect itself

That method is in DataView.

        dataView = select.setItems(items);
        dataView.getItems();

Also, is there any way to get all the Items from TwincolSelect so that we can append the items asynchronously in the Twincolselect

Why? It will not help with the rendering issue ...

[TatuLund]

same functionality for 300 data items then it's working perfectly fine .

Yes, observed the same. There must be something quadratic complexity in rendering phase as with smaller counts the performance is tolerable.

When I added 1000 similar custom Checkboxes as I have in TwinColSelect to normal VerticalLayout it is not slow

In this profile I do not see insertBefore taking time. I am a bit puzzled, as what TwinColSelect does internally is the same.

[TatuLund]

I also noticed that this slowness happens with Chrome/Edge. With Firefox it is not slow.

[madhu1830]

I also noticed that this slowness happens with Chrome/Edge. With Firefox it is not slow.

yes it's faster in Firefox then Chrome/Edge but in vaadin 23 it's rendering even faster then Firefox(with vaadin 24 ).There is difference of 3-4 secs in rendering .

[TatuLund]

Fixed by version 3.1.0

[TatuLund]

[madhu1830]

Thank you so much . is it version 3.0.1 or 3.1.0?