DOM has always been incredibly slow. Quantum showed that CSS layout has been incredibly slow. Servo showed that HTML layout is incredibly slow. In addition, the

DOM has always been incredibly slow. Quantum showed that CSS layout has been incredibly slow. Servo showed that HTML layout is incredibly slow. In addition, the DOM is extremely memory intensive no matter what you use. A great example is VS Code switching from HTML to Canvas for Terminal. Performance increased by several times. React Native is another example. It performs much better than a Webview even though it still uses JS. Gnome and GJS perform better than any electron app out there while using way less memory. I assume that when you say query string, you are talking about document.querySelector() rather than the actual query string in the URL. Modern apps using something like React almost never use those. Even with a lot of care, those apps will still be slower than apps written with native GUI frameworks.