Wow wtf. Didn't know it was that serious.1+ seconds is an eternity for user experience. Makes a site feel very sluggish if you have to wait that long for things to start loading in the browser.
Ideally you want < 200ms to make site response feel snappy.
First visit load times are critical for engagement with the site and for SEO ... Google now measures these things and penalises slow sites.
I believe Amazon did some studies on their own website on load times and found that even a 100ms delay in load times lead to a dramatic drop in sales. Similarly, Google found that adding more search results to a page (at the cost to a 500ms delay in load times) resulted in far fewer searches being performed, and a substantial drop in revenue from search traffic.
Here is a page that summarises some of the reports about page load times (see reference links at the bottom of that page for sources).
Page load times and responsiveness do matter.
Note to self, after installing Microcart make sure it loads super fast.