I know there is a flair cache (about 24 hours to expire). I understand that this is needed for performance. It will be nice however to have ability to click "force flair update".
It can be CAPTCHA-protected, so people will not use it if they don't really need. This way it will not be a performance killer, right?
Sometimes folks just can't wait to see their new badge or some other "big accomplishment" on their flair.