Stop GUI Thread from freezing

I have a C# (.NET 4), GUI (WPF) program that uses BackgroundWorker (that calls a "Parallel.For" in it)

and i noticed that the GUI thread is always freezing so that the cores can work on the o开发者_JS百科ther threads.

The GUI Thread has no tasks to perform so that's not the reason I'm experiencing slow GUI.

Thank you

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If the UI thread is executing the Parallel.For it will block until all parallel thread have finished their work!