Chrome's "Audit" Tab recommends the following: The following external CSS files were included after an external JavaScript file in the document head. To ensure CSS files are downloaded in parallel, always include external CSS before external JavaScript. 3 inline script blocks were found in the head between an external CSS file and another resource. To allow parallel downloading, move the inline script before the external CSS file, or after the next resource. This provoked the following comments on IRC: <wizzyrea> that "optimize the order of styles and scripts" is almost certainly caused by those sysprefs though <oleonard> That one we should file a bug for So this is the bug...
*** This bug has been marked as a duplicate of bug 17858 ***