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DataGrid not scrolling smoothly

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I have a DataGrid which usually contains approx 30 rows it rarely goes above 200. My problem is when the user goes through the contents of the grid with the up/down arrow keys it keeps getting stuck(approx 10 to 40 seconds) and then jumping several rows at a time My DataGrid It's not using Entity Framework, and the data is on a very busy virtual server. Can anyone point to somewhere to look for a solution or indicate any problems in my XAML? EDIT I'm starting to think that I'm just trying to get the grid to do too much! JavaScript questions and answers, JavaScript questions pdf, JavaScript question bank, JavaScript questions and answers pdf, mcq on JavaScript pdf, JavaScript questions and solutions, JavaScript mcq Test , Interview JavaScript questions, JavaScript Questions for Interview, JavaScript MCQ (Multiple Choice Questions)

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you disable EnableRowVirtualization and EnableColumnVirtualization and also you do something in PreviewKeyDown="DgInvoiceLines_PreviewKeyDown" this could slow down the grid scrolling

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