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Speed Medium impact Medium depends on the cause

Excessive DOM

The element count exceeds a reasonable limit.

What it is

The page has an excessive number of HTML elements. This burdens memory and CPU and slows down rendering and interactions.

Why it matters

Same as for DOM size — more nodes mean more work for the browser on every change and worse smoothness on weaker devices.

How to do it

  1. 1Reduce unnecessary wrapper elements and nesting.
  2. 2Paginate/virtualize long lists and tables.
  3. 3Simplify complex components and templates.

Conclusion

See the topic "DOM size". The cause is usually bloated templates or long lists without pagination — address that first, it brings the biggest relief.

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