Rendering timeline
Inspect screenshots, filmstrips, Speed Index, first visual change, and the final rendered page.
Free online website speed test · Beta
Free website speed test. Real browser results.
Check your website speed for free in real Chrome—no account or signup required. Diagnose rendering, network requests, page weight, waterfalls, screenshots, and loading video in one permanent report.
No account requiredShareable reportsWebGL support
new-performance-testOne cold-cache measurement · Real Chrome
REAL CHROMEBrowser-level measurements
NEW YORKControlled test location
COLD CACHERepeatable first visits
FULL REPORTPermanent shareable URL
A free website performance test with no signup.
Use Lighthouse Test as a focused GTmetrix or WebPageTest alternative for quick page speed diagnostics, detailed request waterfalls, visual loading filmstrips, and reports you can share with your team.
Diagnose the entire load
More than a single performance score.
Understand when content appears, what the browser downloads, where time is spent, and what your visitors actually see while the page loads.
Request waterfall
Review every asset, domain, status code, timing phase, transferred byte, and blocking request.
Performance guidance
Find oversized assets, cache problems, slow backends, excessive JavaScript, and layout instability.
Cold-cache measurement
Each test starts with an empty browser cache for a controlled first-visit measurement.
WebGL page support
Measure panoramas, virtual tours, and visual experiences that require a software WebGL renderer.
Permanent result links
Send the complete report to developers, clients, marketers, or anyone investigating an issue.
Export the network trace
Download the HTTP archive and give it to your AI coding agent for deeper request, caching, and dependency analysis. Review sensitive headers before sharing.
Browser performance metrics
Measure the moments users notice.
Each controlled lab test captures essential loading, responsiveness, stability, and network measurements.
LCPLargest Contentful PaintWhen the largest visible content element finishes rendering.
CLSCumulative Layout ShiftHow much visible content unexpectedly moves during loading.
TBTTotal Blocking TimeHow long main-thread work prevents the page from responding.
SISpeed IndexHow quickly the visible area of the page fills with content.
TTFBTime to First ByteHow quickly the server begins returning the document.
WEIGHTPage weight and requestsTotal transferred data, request volume, domains, and asset types.
How it works
From URL to evidence in three steps.
Enter a public HTTPS URL
Start one cold-cache measurement from the New York test node.
We launch an isolated Chrome session
The browser loads your page with an empty cache and records network, CPU, video, and rendering data.
Explore and share the report
Use the permanent link to review metrics, waterfalls, screenshots, assets, and recommendations.
● REPORT COMPLETEexample.com
LCP1.8 s
CLS0.03
TBT140 ms
Weight1.7 MB
Requests64
Website speed test FAQ
Questions before you run a test.
What does this website speed test measure?
It measures browser loading milestones, rendering progress, layout stability, blocking time, server response, network requests, transferred bytes, and page composition under controlled lab conditions.
How is each test performed?
Each test runs one cold-cache Chrome visit from the New York node and produces a permanent report.
Is this the same as real-user monitoring?
No. This is a synthetic lab test from a controlled New York machine. It is ideal for debugging and repeatable comparisons. Real-user monitoring and CrUX data describe experiences collected from actual visitors.
Can it test virtual tours and WebGL websites?
Yes. Software WebGL rendering allows interactive panoramas and 3D viewers to render, request their image tiles, and appear in screenshots and network reports even without a physical GPU.
Is this a free GTmetrix or WebPageTest alternative?
Yes. Lighthouse Test is a free GTmetrix and WebPageTest alternative for running real-browser page speed tests and sharing detailed results without creating an account. Different tools use different test hardware and settings, so compare trends within the same platform rather than treating scores as interchangeable.
Will a speed test affect my server?
Each test performs one real cold-cache page visit and downloads the resources needed by that page, creating roughly the same origin traffic as one visitor plus any third-party requests.
See what your browser is waiting for.
Run a free test and get a permanent performance report.