I don&#x27;t think this paper is the source I remember. I seem to recall something from Microsoft Research. But, it reaches the same conclusion.<p>Article with easy summary and link to paper: <a href="http:&#x2F;&#x2F;johnnyholland.org&#x2F;2008&#x2F;11&#x2F;the-effect-of-the-progress-bar&#x2F;" rel="nofollow">http:&#x2F;&#x2F;johnnyholland.org&#x2F;2008&#x2F;11&#x2F;the-effect-of-the-progress-...</a><p>Edit: here&#x27;s a large collection of articles<p><a href="https:&#x2F;&#x2F;github.com&#x2F;Zhouzi&#x2F;reactivedesign&#x2F;blob&#x2F;gh-pages&#x2F;README.md" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;Zhouzi&#x2F;reactivedesign&#x2F;blob&#x2F;gh-pages&#x2F;READM...</a>