The best first step to improving the JavaScript performance of your web site is to simply include the latest
version of jQuery, as every new release brings more optimizations and bug fixes. Requesting jQuery from a CDN
is also a good choice, as it will minimize the loading time of your site (a CDN is faster to serve the library, and
many people could have it in their caches in the first place)

Instead of including a specific version of the library, you can opt in for a specific major version with the latest
minor release available at the moment, or even request the absolutely newest version of jQuery. Use the latter
option with caution, as your code could stop working if there are breaking changes between major releases.