what i do in long report-generating scripts is to send a

<script>
updateProgressbar( $percentCompleted )
</script>
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to the browser from inside the loop that's doing the computation. Obviously, i define function updateProgressbar(percent) in some globally included .js file.
Works great for me, but just be careful not to send something like this on every iteration of a fast-iterating loop, since you could easily clog even broadband connections with millions of these instructions. i usually do something like

&printProgessJavascript( %percent ) if ($i++ % 1000 == 0);
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on the perl side.

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