Use a CDN
Remember, you can always use the CDN for your very familiar and shared libraries. (I think about this a lot.) And of course, if your CDN fails, you can always fall back locally. But when you do this, you’re generating another HTTP call which can slow down your site, right? I used to be somewhat against this idea, but with the proliferation of sites using the shared CDNs, we don’t actually have to issue that next HTTP. A lot of your visitors might actually have this cached right on their system now and don’t need to make that round trip.