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IMultiValueConverter and IValueConverter Interface lagging (slowness)

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Hi,

I was using IMultiValueConverter in my project in which I will be doing some business calculations. for this I will be using the following.

1. An DataTable
2. An XML and,
3. Some coloring logic.

I am trying to apply color for some cells in the DataGrid by performing an business calculation using the above mentioned together or any one of it. In all the cases am getting some lagging (slowness) in  applying color to the deserved cell. but if I simply return color without performing an business calculation it works fine (So am sure that there is no mistake in applying or the way I integrated IMultiValueConverter)  which means I was not calculating any business logics using the above mentioned things.

My Question was is there is any limitation in using IMultiValueConverter and IValueConverter in such a way that it was not overloaded with response time to the control to which it was bounded?

Note: please let me know if any one can't understand my question

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