I found out today that if you have JavaScript and CSS externally linked in your HTML head, the CSS should come first. This will allow browsers to fetch both external files at the same time. I use JavaScript to do some last minute page styling, depending on some parameters and also found that this helped the page flicker.
On a related note, the Page Speed add-on to Firefox is a handy little tool for determining areas for improvement for a website (that's where I learned of this CSS before JS tip).
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