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Summary I have a large an rapidly changing dataset which I wish to bind to a UI (Datagrid with grouping). The changes are on two levels; Items are frequently added or removed from the collection (500 a second each way) Each item has a 4 properties which will change up to 5 times in its lifetime The characteristics of the data are as follows; There are ~5000 items in the collection An item may, within a second, be added then have 5 property changes and then be removed. An item may also remain in some interim state for a while and should be displayed to the user. The key requirement which I'm having problems with; The user should be able to sort the dataset by any property on the object What I would like to do; Update the UI only every N seconds Raise only the relevant NotifyPropertyChangedEvents If item 1 has a property State which moves from A -> B -> C -> D in the interval I need/want only one 'State' change event to be raised, A->D. I appreciate a user doesn't need to have the UI updated thousands of times a second. if an item is added, has its state changed and is removed all within the window of N seconds between UI updates it should never hit the DataGrid. DataGrid The DataGrid is the component which I am using to display the data. I am currently using the XCeed DataGrid as it provides dynamic grouping trivially. I am not emotionally invested in it, the stock DataGrid would be fine if I could provide some dynamic grouping options (Which includes the properties which change frequently). The bottleneck in my system is currently in the time taken to re-sort when an item's properties change This takes 98% of CPU in the YourKit Profiler. A

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