Page speed analyzer
Full page load analysis with request waterfall, visual filmstrip, video recording, and a breakdown of every metric. Not just a score — a diagnosis.
Real Chrome · Lighthouse v12 · CrUX field data
The problem
You know your site is slow. PageSpeed says 47. But where do you start? Is it a slow server, too much JavaScript, unoptimized images, or a third-party script blocking render? Without a full load analysis, you're guessing.
What you get
Every network request visualized in load order with DNS, TCP, TLS, TTFB, and download timing. Spot bottlenecks at a glance — slow APIs, render-blocking scripts, oversized images.
See exactly what your visitors see at every moment during page load. Frame-by-frame filmstrip with metric markers plus full video recording.
TTFB, FCP, LCP, TBT, CLS, and Speed Index — each explained with your specific values, what they mean, and whether they pass Google's thresholds.
Total page size broken down by resource type — HTML, JS, CSS, images, fonts, and third-party. See exactly what's making your page heavy.
Page load speed measures how quickly a web page's content becomes visible and interactive to a user. It's determined by multiple factors: server response time (TTFB), how many resources the page needs to load, how large those resources are, and whether anything blocks rendering. DebugUtils breaks all of this down in a single report.
The request waterfall is the most diagnostic tool. It shows every resource your page loads in chronological order with full timing breakdown. Look for: long TTFB (slow server), render-blocking JS/CSS (delays content), large images (slow downloads), and slow third-party scripts. DebugUtils highlights all of these automatically.
A request waterfall is a visualization of every HTTP request a browser makes to load a page, displayed in chronological order. Each bar shows DNS lookup, TCP connection, TLS handshake, server response (TTFB), and download time. It reveals the critical path — the chain of requests that determines how fast your page loads.
Google considers a Largest Contentful Paint (LCP) under 2.5 seconds as 'good.' For overall page load, under 3 seconds is the target for most sites. However, what matters most is the perceived speed — when users can see and interact with content, not when every resource finishes downloading.
Every kilobyte your page loads needs to be downloaded by the visitor's browser. A 5MB page on a 3G connection takes over 13 seconds just for the download. DebugUtils breaks down page weight by resource type (JS, CSS, images, fonts) so you can see exactly where the bloat is and prioritize reductions.
Paste any URL. We handle normalization, redirects and protocol detection.
A real Chrome browser runs Lighthouse and captures network data, screenshots and video.
Scores, metrics, waterfall, filmstrip, video and recommendations — ready in under 2 minutes.
Results are shareable via URL and stored for 90 days. No account needed.