Performance Summary
Optimise jQuery by caching selectors, batching DOM changes, using event delegation, debouncing handlers, using CSS animations over jQuery.animate(), and virtualising large lists. Profile with DevTools to find real bottlenecks.
jQuery
Beginner
3 min read
jQuery Performance Summary
Example
// jQuery performance checklist:
// [x] Cache: const $el = $("#el") — not repeated $()
// [x] Batch DOM: build string then .html(str), not .append() in loop
// [x] Delegate: $(parent).on("click", ".child", fn)
// [x] Debounce: clearTimeout/setTimeout on input events
// [x] CSS animations: addClass/removeClass, not .animate()
// [x] Slim jQuery: if no AJAX/animate needed
// [x] detach() for heavy DOM manipulation
// [x] Virtual scroll for 500+ row lists Pro Tip
Measure first, optimise second — perceived performance (skeleton screens, instant feedback) often matters more than ms benchmarks.