Memory leaks in JavaScript don't announce themselves with an error. They show up as a heap that grows by 20MB per minute — invisible in a five-minute Lighthouse run, fatal in a six-hour production session. Why React apps leak: A useEffect that opens a WebSocket and never closes it on unmount. A setInterval without clearInterval in the cleanup return. A global Map that grows without bound. In each
I've been building web applications for 8 years, and locale handling has always been my silent killer. Date formats break in production, currency symbols get mangled, timezone calculations drift—all caught too late. That's why I took TestSprite for a real project spin. Integration testing is boring, expensive, and brittle. Write 100 Selenium tests, change the UI once, watch 60 fail. Most teams eit
Random 30–50ms freezes with no obvious long tasks in the Performance panel often have one root cause: the garbage collector. V8 pauses JavaScript execution to reclaim memory, and if your allocation rate is high enough, those pauses happen frequently — creating jank that shows up as a sawtooth pattern in the memory timeline rather than a spike in the flame chart. What this covers: How V8's generati