Hello Ed M.,
Thank you for writing.
It is true that there is performance decrease when exporting with visual settings. In addition, we do not support running export in a background process. Although such scenario works, the UI thread is still used to traverse the grid and this explains why if you minimize the form it finishes faster. Unfortunately, there is not a way to overcome this limitation except exporting without visual settings.
We are looking into the issue and have plans to improve the performance. However, I am unable to give you an exact time frame for this feature yet.
Let me know if you have any other questions.
the Telerik team
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