We have plans to improve the Minifier and fix the major issues with it, but this particular is a big technology challenge, because of the nature of the Minifier. Considering the algorithm behind it and the amount of XAML and classes contained in bigger xaps, this operation will be slow. We will try to improve it for sure, but still we don't have exact date when this will happen.
Thank you for your patience.
the Telerik team
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