You’ve seen the seamless browser demos: shimmering scatterplots, maps projected on the fly, smoothly scrolling tables with endless data, in-browser arcade games, single-page apps that feel like a desktop app. But on your project, when you press a button it takes more like a second or two to get a response. Your grids stutter. Animations just don’t fire at the right time. How can you make your front-end code fly?