No one wants a slow website, but knowing what's slowing down your website can often be a mystery. On top of that, Google PageSpeed Insights often makes matters worse. Luckily, there's an easier tool called YSlow:
YSlow is a browser plugin that provides an easy to understand interface. YSlow assigns a letter grade next to each item allowing you to quickly pinpoint the trouble areas on your website.
And who doesn't like a pretty chart to show you what's going?
YSlow is a great tool to have in your arsenal and far easier to understand than many other tools out there. Best of all, it's free!