I put together a jsperf you can probably edit to show the perf speedup: http://jsperf.com/reverse-visibility-test

At the top of the preparation code there is a line `<script src="http://code.jquery.com/jquery-git2.js"></script>` that you'll need to change to reference a copy of your patched version, if you have something like Dropbox you can reference it from there.

You'll need to do some more changes to the test cases to set up a dirty layout beforehand, adding some classes to ancestor elements should do it but you may need to play with their styles to force specific width changes.