Explain why a site is slow, and what to fix first.
Paste a URL and get a plain-language performance report that points to the exact images, scripts and fonts slowing the page down. Ready to share with your client or your developer.
Free, no account
Run up to 3 analyses per day without signing up.
Specific, not generic
Every finding points to an element on the page, not to a score.
Every feature, free
A free account adds 20 analyses per day, saved history, device selection and pages behind a login.
Try it now
Analyze a page now.
Paste a URL and get a performance report in plain language, with the exact images, scripts and resources that slow the page down.
LCP and CLS — the two most impactful Google ranking signals. Auto-drills into sub-parts when issues are found.
Enter the full website address to start a performance analysis.
What you get
From a slow page to a prioritized fix list.
Each analysis runs real performance checks in a browser, points to the specific elements causing problems, and explains what to fix first.
Why not just PageSpeed Insights?
PageSpeed Insights tells you how fast a page is. PerfReviews Insights tells you why, and what to fix first. Use both: PageSpeed Insights for the score and Google's real-user data, Insights for the diagnosis.
Freelancers who need to show a client why their site is slow
Agencies preparing a performance review before a redesign or a pitch
SEO consultants who need Core Web Vitals findings a developer can act on
In-house marketers who need to brief their development team
Simple mode
Single URL input, automated multi-snippet analysis, and a readable report.
Advanced mode
Snippet-level controls, custom headers, and power-user workflows for client work and deeper troubleshooting.
Built by Joan León
Web performance consultant at PerfReviews and author of WebPerf Snippets, the open source collection of performance scripts that powers every check in this tool. The findings and recommendations follow the same criteria used in real client audits.
FAQ
Common questions
Simple mode runs nine automated checks focused on visible performance issues such as LCP, CLS, TTFB, render-blocking resources, image loading, video handling, page weight, and third-party scripts.
No. You can run 3 analyses per day without one. A free account raises that to 20 and adds saved history, device selection, custom headers and advanced workflows.
Freelancers, agencies, SEO consultants, and in-house marketers who need to explain a performance problem to a client or a developer, and know what to fix first.
Yes, every feature. The tool is how people get to know PerfReviews; when you need an expert, you can ask for a review of your report or a full performance audit.
Start with a free report. Ask an expert when you need one.
Run a free analysis now. When you want someone to tell you what to fix first, Joan León reviews your report himself.