Does Too many ids hurt performance

Question

If I have in the page unnecessary ids on elements, like the HTML Helper does in ASP.Net-MVC.
Does it reduce the performace of my i

Answer 1

Selecting elements by id in jQuery is one of the few selectors that will not receive a performance hit if there are many elements on the page.

If on the other hand, you were selecting elements based on class or attribute value, you would see a significant performance hit. If you are worried about performance, also make sure to cache your jquery selectors by storing the selectors in variables for reuse.

var element = $("#specificElement");
console.log(element.val());