publicReal User Monitoring

See your site through real users' eyes

Lighthouse scores tell you what could be slow. RUM tells you what is slow — for the real visitors on real devices with real connections hitting your site right now. One script tag, zero overhead.

Start Monitoring Freearrow_forwardView Pricing
5Core Web Vitals tracked
P75Google-standard percentile
0 PIIGDPR-safe by design
dashboard.perfbee.com/rum
4,823 sessions· last 7 days
↓ 18% vs last week
LCP1.8sGood
CLS0.04Good
INP112msGood
FCP0.9sGood
TTFB180msGood
LCP P75 · 7-day trend
2.5s threshold

One crawl checks your whole site — content, links and speed.

fact_checkComplete

Content Monitor

Flags every page missing a required label, doc, banner or schema.

link_offCorrect

Broken + Missing

Broken links and technical SEO caught in one crawl.

speedFast

2KB RUM

Real Core Web Vitals from real visitors, no bloat.

notifications_activeAlways on

Daily scans

Scheduled crawls with drift alerts the moment something slips.

Free forever plan · Paid plans from $19/mo · No credit card to start

How It Works

Up and running in 60 seconds

No npm install. No build step. Just one script tag and real data starts flowing.

code
01

Add One Line of Code

Paste a single <script> tag into your HTML. No SDK, no npm package, no config file. It loads async and defer — zero impact on your page speed.

sensors
02

Collect Real User Data

Every page load from every real visitor sends Core Web Vitals, device type, browser, connection speed, and broken resource URLs — automatically.

notifications_active
03

Get Alerted on Regressions

PerfBee detects when your LCP, CLS, or INP degrades vs your 7-day baseline and emails your team before users start complaining.

index.html
<!-- Paste before </body> -->
<script
src="https://cdn.perfbee.com/rum.js"
data-token="your-site-token"
async defer
></script>
check_circleThat's it. Data starts arriving within minutes.

Capabilities

More than a performance dashboard

Real data, broken down by page, device, browser, and connection — with automatic anomaly detection built in.

web_traffic

Top Pages by Impact

See LCP P75 for your highest-traffic pages. Each page gets an impact score — sessions × performance gap — so you know exactly where to focus optimization effort first.

PageSessionsLCP P75Pass
/blog/web-vitals-guide1,4201.4s
98%
/pricing8902.1s
87%
/products/checkout6403.8s
34%
/3,1001.2s
99%
devices

Device & Browser Breakdown

Compare LCP, CLS, and INP between mobile and desktop users. See which browsers are struggling. Spot if 3G users are having a disproportionately bad experience.

smartphoneMobile2,841
LCP2.4s
CLS0.05
INP148ms
desktop_windowsDesktop1,982
LCP1.1s
CLS0.02
INP68ms
Browser Distribution
Chrome
62%
Safari
24%
Firefox
9%
Edge
5%
notifications_active

Anomaly Alerts

Automatic baseline comparison every 24 hours. If LCP spikes 1.5× above your weekly average, you get an email — before users start bouncing.

compare_arrows

Lab vs Real Users

See how your Lighthouse score compares to actual P75 metrics. A 50% gap means real users are experiencing something your lab tests never caught.

link_off

Broken Resource Detection

Every 404 from every real user session is recorded. Images, fonts, scripts — know what's failing in production before your users screenshot it.

bug_report

JS Error Tracking

Top JavaScript errors from real sessions, ranked by frequency. No external error tracking tool needed — it's built right into your RUM data.

biotechLCP Attribution

Know exactly which element is slowing you down

Most tools tell you LCP is 3.2s. PerfBee tells you it's the <IMG> at /hero-banner.webp — and how many users hit it. That's the difference between a diagnosis and a fix.

  • check_circleHTML element tag causing slow LCP (IMG, DIV, VIDEO)
  • check_circleExact resource URL for image/media elements
  • check_circleOccurrence count — how many real users affected
  • check_circleSorted by LCP P75 so worst offenders are first
LCP Attribution — Slow Elements
last 7 days
IMG
/images/hero-banner.webp
1,842 users affected
4.2s
IMG
/images/product-grid.jpg
634 users affected
3.8s
DIV
— (background-image)
289 users affected
3.1s
IMG
/blog/featured-post.png
156 users affected
2.9s
tips_and_updatesTip: Preload your hero image to fix 38% of slow LCP sessions.
bar_chartWhy It Matters

Lab data lies. Real users don't.

Lighthouse runs on a fast machine in a controlled environment. Your users are on 3G in a coffee shop with 40 browser tabs open. RUM is the only way to know what they actually experience.

people
100%
Of your real users — not a synthetic lab test
data_usage
<1 KB
Script size gzipped — zero impact on your scores
no_encryption
0 PII
No user tracking, no cookies — GDPR-safe by design
Start Monitoring Freearrow_forward
notification_important
Performance Regression Detected
example.com · last 24h vs 7-day baseline
LCP
1.8s
3.4s
+89%
INP
95ms
210ms
+121%
CLS
0.04
0.12
+200%
Lab vs Real Usersexample.com/products
LCP
Lab: 1.2s
Real: 2.8s
+133%
CLS
Lab: 0.01
Real: 0.07
+600%
INP
Lab: 65ms
Real: 95ms
+46%

The rest of the platform

One crawl, every kind of problem

Everything below runs on the same scan of your site, so what's missing, what's broken and what's slow all land in one place.

fact_check

Content Monitor

Checks that every page still has the labels, manuals, docs and schema it is supposed to have — and alerts you when a template change drops them.

Learn morearrow_forward
travel_explore

Site Crawler

Cloud crawler for broken links, redirect chains, meta issues and indexability — no desktop install.

Learn morearrow_forward
speed

Performance Boost

Lighthouse audits and Core Web Vitals over time, with AI-suggested code fixes.

Learn morearrow_forward
style

Critical CSS

Extract above-the-fold CSS and inline it — the biggest LCP win with zero manual work.

Learn morearrow_forward

Your website has something broken — or missing — that you don't know about yet.

Broken links, slow pages, and the labels, manuals and banners that silently vanish when a template changes — PerfBee finds them all and tells you exactly how to fix them.

Start Free AuditSee how it works
  • Free forever, no credit card
  • Your first audit in minutes
  • Built for large catalog sites