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How can I reduce the execution time of large DOM updates in JavaScript for better performance?

Asked on Nov 04, 2025

Answer

To reduce the execution time of large DOM updates in JavaScript, you can use techniques like batching updates, using Document Fragments, or leveraging requestAnimationFrame for smoother updates.

<!-- BEGIN COPY / PASTE -->
        const fragment = document.createDocumentFragment();

        for (let i = 0; i < 1000; i++) {
            const newElement = document.createElement('div');
            newElement.textContent = `Item ${i}`;
            fragment.appendChild(newElement);
        }

        document.getElementById('container').appendChild(fragment);
        <!-- END COPY / PASTE -->

Additional Comment:

Using a Document Fragment allows you to batch DOM updates, which minimizes reflows and repaints.
Append all new elements to the fragment first, then append the fragment to the DOM.
This approach is more efficient than appending each element directly to the DOM in a loop.
Consider using requestAnimationFrame for animations or updates that need to be synchronized with the display refresh rate.

✅ Answered with JavaScript best practices.

Ask any question about JavaScript here... and get an instant response.

How can I reduce the execution time of large DOM updates in JavaScript for better performance?

Asked on Nov 04, 2025

Answer

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