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POUI thread stalls on loading and updating a RadGridView object
 

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    <p>Afternoon all,</p> <p>I'm currently profiling a rather large C# WPF app, trying to eliminate a few performance issues. One involves a 5-8 second stall that occurs when switching to a particular (rather large) UserControl. I've narrowed this down to a RadGridView contained in this UserControl that's taking a long time to load and update itself, stalling the UI thread and making the entire application unresponsive. Obviously, we'd like to eliminate this stall if possible.</p> <p>I have tried stripping away any custom styles and DataTriggers on the grid, but while this acted to reduce load on the UI thread in general, the stall still remained, seemingly undiminished. Through ANTS Profiler, it seems that the measuring and layout of the grid is mostly to blame, along with some loading of XAML templates. With no grid rows, the UserControls loads significantly faster, and it seems that adding just a small number of rows is enough to bring about this stall. The grid has virtualization enabled for rows and columns, but this doesn't seem to help. The call graph is tremendously deep when examined, and it seems to be calls that raise update notifications, update layout, load XAML and, above all, measure child FrameworkElements that are to blame.</p> <p>For a couple of potential solutions, I'm thinking about keeping the UserControl in memory but hidden to reduce the costs of switching to it, or populating the grid, perhaps incrementally, well after the UserControl has loaded. There might be a lot of work with the former, as the control subscribes to a number of things, which would need to be connected to, disconnected from and reconnected to as appropriate. The latter might also involve a fair bit of work, but might be a better solution, because then at least we could try to mitigate the stalling ourselves, or at least warn the user when it was occurring.</p> <p>If the problem persists, we're likely to ask Telerik to have a look at it, but I thought I'd ask here first in case anyone has encoutered such an issue before (not necessarily with RadGridView, even) and found a solution of some description.</p> <p>Cheers.</p>
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    1. USPratik
    1. USChris Mantle
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      1. USJulien Lebosquain
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    1. COThis is a general problem with Telerik WPF controls and RadGridView in particular. They are pretty fast for scrolling (the .NET 4 WPF built-in Datagrid is terrible at this), built-in filtering, etc... But they have an awful load coast that can't be reduced. Just look at their WPF demos: each takes 3-4 seconds to load on a fairly modern PC. I've given up on them.
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      1. USJulien Lebosquain
 

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