How Deep is Your DOM? | Frontend at Scale

Lighthouse warns us about large DOM sizes because they increase memory usage and can produce expensive style calculations . This can have a significant impact on user experience, especially for users on lower-end devices.

When we work with a tree data structure like the DOM, its depth has a lot to do with how fast operations such as lookups perform on them.

The deeper a tree goes, the more operations it could take to access one of its elements.

A tree's height and balance impact efficiency and performance, as seen with Binary Search Trees. Consider self-balancing BSTs to maintain a minimum height and fast operations.

Deep DOM trees in CSS can be problematic. Large and nested trees result in expensive style recalculations, affecting performance and responsiveness.

• To decrease issues with styling, keep the DOM tree shallow and wide
• Self-balancing BSTs can also help reduce tree height and improve performance
• With a shallow and wide DOM tree, style recalculations are quicker, improving app response time

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