Chrome's "Audit" Tab recommends the following:
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 ***