Operations | Monitoring | ITSM | DevOps | Cloud

You run Lighthouse and it tells you your Speed Index is bad. But the page looks like it loads fine. You see stuff on screen early. So why is Lighthouse acting like your site is a sloth? Speed Index is a “how fast does this page visually fill in” metric. Not “when did the first pixel show up” (that’s FCP) and not “when did the main content show up” (That’s LCP). It’s the whole above-the-fold loading experience, averaged over time.

You’re reading an old performance article, and it keeps talking about “First Meaningful Paint.” You search for how to improve it, but every tool gives you different advice. Some don’t mention it at all. What’s going on? Here’s the short answer: First Meaningful Paint is dead. Google deprecated it in Lighthouse 6.0 back in 2020 and removed it completely in Lighthouse 13. If you’re still trying to optimize for FMP, you’re chasing a ghost.