How do I judge technical quality when I am not technical? — answered by Engineer Saeed Baatiah
Three tests that need no programming background: open the site on your phone on mobile data rather than Wi-Fi and time when content appears — over three seconds means a performance problem. Try the strangest scenario you can imagine: type letters into a number field, or press submit twice — a good system stops you with a clear message instead of breaking. And ask for a report from Google’s free PageSpeed Insights and read the numbers yourself.