Non-HTML elements like JavaScript and Flash can weigh down a website's load time and negatively impact its SEO performance. Just like you wouldn’t take a heavy backpack with you to run a race and expect to win - or even finish - any extra weight on your website can do the exact same thing, slowing it down more and more as you load more onto it. Too many non-HTML elements on a website can cripple page load times and frustrate users, leading to a higher bounce rate and lower rankings.