Reproduction steps

Expected Results

The Jenkins logo tag should have width and height attributes defined. This allows the browser to allocate the correct space for the image before it loads, preventing Cumulative Layout Shift (CLS) and improving the performance score.

Actual Results

The logo is rendered using a standard tag without dimensions:
<img alt="Jenkins logo" src="/jenkins.png">

Lighthouse flags this as a performance issue because it causes the navigation bar or header content to "jump" once the image file is fully downloaded.

Anything else?

This is a minor UI/Performance optimization.