Replace jittery spinner icon
Jittery FontAwesome spinners are a known UI bug: https://github.com/FortAwesome/Font-Awesome/issues/671
I suggest swapping out the spinner icon with eg an icomoon spinner: http://codepen.io/Keyamoon/pen/aHxuq
Not a site-breaking bug by any means, but it might make things look just that little bit nicer.
A thousand times yes!