I did some speed testing and discovered that AWS and Google are slow at serving fonts. I'd had Google hosting the font (Open Sans) used on this website for some years. Using pingdom.com, I determined that loading just that one font was adding about 200ms to my page load time.
So I downloaded the font from Google using localfont.com, and put a modified version of the CSS that that tool produced onto my AWS S3 slice along with the only font file I really use.
This resulted in equal page load times.
Concerned, I put the CSS and a single font file on my site's native server (on linode.com) Now I'm seeing load times of 30ms for the font.
And as a bonus? No mysterious Google .js loads, doubtless tracking my visitors.