A follow-up to an earlier post on JavaScript performance gotchas, this one digs into five more pitfalls that quietly drag down web apps as they grow: wrong data structures, one-at-a-time DOM updates, CPU work on the main thread, listeners on every element, and regexes that backtrack catastrophically.
The full post pairs each gotcha with a before/after snippet — Set vs Array for uniqueness, document fragments for batched DOM updates, Web Workers for heavy compute, event delegation, and tighter regex patterns — plus a short verdict on when the fix actually matters.
Originally published at andreasbergstrom.dev — read the full post there.
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