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

While the JavaScript performance will be unaffected, thousands of ids make your HTML bigger, increasing the load time and traffic cost. It's probably negligible (compressing images and other resources is far more important), but may be a route for optimization nevertheless.