Javascript

If you’ve seen the term “Core Web Vitals” and kept scrolling, this article is for you. It’s not just SEO jargon. These three metrics are the clearest signal we have for whether a web app feels fast to a real user — and they’re measurable directly from your React code. This article covers what the three metrics actually mean, how to measure them without any external tools, and what to do when they’re bad. ...

Monitoring and Alerting Are Different Jobs. Most React Teams Only Have One. Tags: #react #performance #webdev #javascript Tuesday you deploy. Thursday your LCP climbs from 1.2s to 2.8s. Friday the reviews start coming in. Your monitoring dashboard shows the spike clearly — it just waited until you opened it to tell you. That’s the gap. Not a tooling failure exactly. More of a category error. What monitoring tools are actually built for Datadog, New Relic, your APM of choice — these are built for historical analysis. What happened over the past week, which pages are consistently slow, where the backend bottlenecks are. That’s genuinely useful work, and they do it well. ...