Javascript: how to update page before onClick is complete?

I have a function that's designed to parse a 20MB XML file. It works well, but I'd like to give some progress indication during the minute or so it takes. This, however, doesn't work: (pauseJS stands in for the processing) The progress bar would only update once processing is done, not during. I saw a [similar question][1], but setTimeout doesn't seem to help in this scenario. [1]:

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