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Page load checker
A real Chromium navigation from Larm's synthetic probe network, scored 0-100 with a full DNS-to-load waterfall.
What the metrics mean
We load your page in a real headless Chromium from our probe network and record the load milestones below, plus a phase-by-phase navigation waterfall. LCP is one of Google's Core Web Vitals and influences search ranking; together these timings shape how fast the page feels to a visitor.
TTFB · Time to First Byte
How long until the first byte of the response arrives. This is your server and network, before the browser renders anything, so a slow TTFB drags every later metric with it.
LCP · Largest Contentful Paint
When the largest element in the viewport finishes rendering, the moment the page looks loaded. High LCP usually means a slow server response, render-blocking resources, or large images.
DCL · DOM Content Loaded
When the HTML is fully parsed and the DOM is ready, before images, fonts, and other subresources finish. A big gap between this and total load time points at heavy assets or late scripts.
Total Load Time
When the load event fires and everything has been fetched and run. This is the headline number, and the score weights it the most, so a faster page scores higher.
How the score works: we run the check from fast infrastructure without throttling, so the 0-100 score rates the page's own speed, not a simulated slow device or connection. That makes it stricter than a throttled Lighthouse run and weighted toward total load time.
Catch page load regressions automatically.
Larm's synthetic monitoring replays real browser journeys on a schedule and alerts your team when load times regress.
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