GoKawiilDeep dive explains why browser main-thread contention causes UI jank in data-heavy apps
A new technical explainer breaks down why the browser's main thread—not slow code or large bundles—is usually the real cause of stuttering scrolling, delayed button clicks, and laggy typing in highly interactive web apps. It notes that JavaScript execution, rendering, event handling, and network callbacks all compete for the same single thread, so once an app becomes interaction-heavy, main-thread contention becomes the dominant performance bottleneck.