Memory Leaks and the Havoc They Wreak
summary
JavaScript engines reclaim unreachable objects but can’t detect everything, so closures and forgotten listeners often keep things alive. Chrome and Firefox DevTools get used to take a heap snapshot before and after interactions, compare diffs, and reveal piles like detached DOM nodes — one example surfaces a thousand of them — or strings that show a tenfold increase. Advice: remove event listeners, dispose third‑party resources, prefer LRU caches, and try performance.measureMemory in origin trial for production footprints.
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