Performance/Glossary

Term	Metadata	Definition	Relevant Links
		One or two sentences	Full definition Related tests/coverage Results User research
SpeedIndex	Visual	(SI) is a page load performance metric that shows you how quickly the contents of a page are visibly populated. It is the average time at which visible parts of the page are displayed. Expressed in milliseconds, and dependent on the size of the viewport, the lower the score, the better.	MDN Documentation