Performance issue occurs when selecting and un-selecting 10000 items in WINUI ListView control

[Subashini2129]

Hi Team,

I am facing performance problem when selecting and un-selecting 1 lakh items in WINUI ListView control. Please find the sample and time taken details below:

Selecting 1 lakh item - 6.09 sec

Un-selecting 1 lakh item - 1.7 min

Adding 10,000 items using SelectedItems property - 2.7 min

Sample:
ListView-performance-sample.zip

Can you please suggest any solution to improvise the performance issue?

Regards,
Subashini M.

[JPTGamesAndApps]

SelectedItems might be old school option from Windows 8. Try using SelectRange and see if it helps. I've noticed a significant performance improvement with that switch: https://docs.microsoft.com/en-us/uwp/api/windows.ui.xaml.controls.listviewbase.selectrange?view=winrt-20348

[StephenLPeters]

@Subashini2129 what version(s) of Winui are you using wheen you see this poor performance? What version of Windows are you using?

[Subashini2129]

@StephenLPeters please find the versions details below:

WINUI version:
NuGet package version:
[WinUI 3 - 0.8.1]

Windows version
Edition: Windows 10 Pro
Version: 20H2
OS build: 19042.1110

[Subashini2129]

@JPTGamesAndApps, I have used DeselectRange method of ListView to un-select 1 lakh item but still I am facing same performance delay of nearly 2 mins.

[SubashiniMahendran]

Hi Team,

Any update on this issue?