WPF and Grouped data performance in .NET framework 4.5: Is there a test?

Question

WPF Listbox or Datagrid exhibit very bad performance when data are grouped due to missing virtualization:

WPF DataGrid Virtualization with Grouping

Performance improvement is promised in .NET framework 4.5. (Improved performance when displaying large sets of grouped data). Is it true? Does somebody tried it?

The hidden programming qustion is should I use net 4.5 as soon as possible or it is useless? — IvanH, Apr 06 '12 at 06:46

score 0 · Accepted Answer · answered May 29 '14 at 12:06

Out of the box there is no performance improvement. It is necessary to set the attached property VirtualizingPanel.IsVirtualizingWhenGrouping (new in framework 4.5), which allows to switch on virtualization when grouping.

<DataGrid EnableColumnVirtualization="True" EnableRowVirtualization="True"
   VirtualizingPanel.IsVirtualizingWhenGrouping="True">

The perfomance gain is enormouse. Expanding of about a thousand member group went from about 40 seconds to a fraction of a sececond.

WPF and Grouped data performance in .NET framework 4.5: Is there a test?

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