The author is Harshal Shah, CEO, and founder of Elsner Technologies, a global IT consulting firm with expertise in Wordpress development and delivering IT solutions on the Web, Mobile and Cloud. He is a tech evangelist with a reputation to provide optimum solutions for business automation and solving real life problems with the power of IT.
Of course, yes. With every plugin you install on your WordPress site, you are sure to slower down you website, even if that means a few milliseconds. However, the hard reality it, your WordPress site is nothing without plugins.