FrontendGeneralHigh signal
Core Web Vitals
Also written as LCP, CLS, INP, Web Performance
A set of metrics Google uses to measure real-world user experience on a page — how fast it loads (LCP), how stable the layout is as it loads (CLS), and how responsive it feels to interact with (INP).
Think of it like
Like a report card grading a store on how fast you can walk in, how steady the shelves are while browsing, and how quickly a clerk responds when you ask for help.
Junior or senior?
Junior sounds like
Says they 'made the site faster.'
Senior sounds like
Names a specific Core Web Vitals metric they improved, how, and by how much.
Ask them
“Tell me about a time you improved a page's load performance. What did you measure, and by how much?”