Why do Graphics operations in background thread block Graphics operations in main UI thread?

It turns out that the answer is to use multiple processes to handle background GDI+ tasks. If you run the above code under the concurrency profiler in VS2010, you'll see the foreground thread blocking on a critical section secured by the DrawImage() call in the background thread.

Any time you have performance problems, you need to consider as many factors as possible. In your case, there's a rather large difference between the label and the redraw implementations.

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