Does jQuery $(this) need to be cached

Question

I recently came accross some blog posts about jQuery performance (i.e. http://net.tutsplus.com/tutorials/javascript-ajax/10-ways-to-instantly-increase-your-jquery-performanc

Answer 1

Well, if you use $this only once, it doesn't really help, but if you use it more that once, it should gain performance.

The big question is, how much performance? It's possible that it's hardly measurable. But it's a good practice to do so anyway.