I don't agree with this, really in any sense at all. Firstly, you could argue that using battle-tested projects with thousands of hours behind them can yield yo

I don't agree with this, really in any sense at all. Firstly, you could argue that using battle-tested projects with thousands of hours behind them can yield you better performance, as well as reducing training time because more new employees will already have the necessary skills. It also tends to be better for accessibility than roll-your-own. Secondly, the article completely forgets to mention what really causes slow down: loading sources from multiple third party domains, especially bulky ads, tracking, and popover scripts.