There is very little functionality JQuery offers that the modern browser DOM API doesn't provide with more robust performance.
Things have really gotten much better in the vanilla world. Although some things remain more verbose or cumbersome than jQuery alternatives, you really don't need a whole layer of abstraction to handle the simple tasks jQuery was designed for any more.
Unless, of course, you care about IE...
"I did my last small project with vanilla js and the ugliness of the native APIs reminded my how lovely jQuery is" or am I seeing wonky here
* veteran of the original browser wars