Combobox performance with high number of items

[audinowho]

I'm using Combobox and recently ran into performance issues, with list load lagging at ~3000 items. WPF solves this by using VirtualizingStackPanel: https://stackoverflow.com/questions/8198645/wpf-combobox-performance-problems-by-binding-a-large-collections

However, the above xaml has no effect when ported directly to AvaloniaUI. Is there an alternative in this library?

[maxkatz6]

Make sure that you set VirtualizationMode="Simple" on the ComboBox. Otherwise it will add all 3000 items to the tree. Default is "None".

@grokys what do you think, should we use ItemsRepeater for controls like ComboBox now (~0.10.1), or should we wait for #4779 ?
Right now it will give us better virtualization/performance in the standard controls, but it will cause breaking changes.

[audinowho]

Works perfectly and much simpler than the WPF answers. Thanks!

[grokys]

what do you think, should we use ItemsRepeater for controls like ComboBox now (~0.10.1), or should we wait for #4779

Not sure there's any simple way to use ItemsRepeater for controls like ComboBox without something like #4779 and that PR is delayed waiting on fixes to upstream ItemsRepeater (microsoft/microsoft-ui-xaml#1829 in particular). And like you say it's going to be a huge breaking change.