ProgressBar is slow in Windows Forms

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This is just how the Vista/7 progress bar is designed. When you change the value of the progress bar, the bar is animated to that value progressively.

The only way I know of avoiding this problem is to go backwards when updating the progress bar, as follows:

progressBar1.Value = n;
if (n>0)
    progressBar1.Value = n-1;

For a more complete discussion see Disabling .NET progressbar animation when changing value?

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