How can you improve the performance of jQuery code?

• Save selections in variables (var $box = $('#box');).
• Use chaining and .find() from a known parent.
• Use event delegation for lists and dynamic content.
• Build HTML first and add it in one DOM change.
• Use classes (addClass) instead of many .css() calls.
• Limit the work in scroll and resize handlers.
• Use the minified file, a CDN or cache, and load scripts at the end of the page.

See Best Practices.

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