Everything you need to find and fix performance issues
Core Web Vitals diagnostics built on real-user data, not one-off lab tests.
Real-user issue detection
Detect LCP, INP, CLS, and FCP problems from real user sessions instead of relying on synthetic test runs.
Automatic problem clustering
Group affected pages, browsers, devices, and sessions into clear performance issues with severity.
Prioritized fixes
See which fixes matter first based on the number of users, pages, and sessions affected.
Session-level diagnostics
Inspect individual user sessions with timelines, metric details, and the exact context behind each issue.
Element-level attribution
Trace layout shifts, slow loads, and interaction delays to affected elements and page contexts.
Easy integration
Add the script, collect production Web Vitals, and start turning raw metrics into diagnostics.
How Laglog differs from common performance tools
The goal is not more charts. The goal is finding the problem to fix.
| Tool type | What it usually tells you | What Laglog adds |
|---|---|---|
| PageSpeed Insights | Lab diagnostics and field summaries for a single URL. | Continuous issue detection across real sessions, affected pages, and changing production traffic. |
| Synthetic monitoring | Scheduled test results from controlled locations and devices. | Problems seen by actual users across browsers, devices, networks, and page groups. |
| Traditional RUM dashboards | Raw metrics, percentiles, filters, and trend charts. | Clustered issues, likely causes, affected sessions, and prioritized fixes. |
| Manual performance audits | A one-time snapshot of known problems that depends on an engineer’s time and effort. | Ongoing diagnostics that detect new problems and affected users automatically, without human involvement. |
Get performance insights in 4 simple steps
See what slows down real users, where issues happen, and what to fix first
Create account
Access your workspace and set up your site.
Choose plan
Pick the traffic volume that fits your business.
Install script
Install the script on the website you want to track and collect metrics from.
Get insights
View performance insights in your dashboard.
FAQ
Why not just use PageSpeed Insights?
PageSpeed Insights is useful for one-off checks and lab-style analysis, but it does not show how your real users experience performance day after day. Laglog continuously collects real-user metrics from your actual visitors, so you can see which pages are slow, where issues happen, and how performance changes over time.
Why not use synthetic monitoring instead?
Synthetic monitoring shows how a scripted test performs from controlled locations and devices. That is helpful for baseline checks, but it can miss what real visitors see across browsers, devices, and network conditions. Laglog focuses on real-user performance insights, so decisions are based on production traffic rather than simulated sessions.
How is Laglog different from other RUM tools?
Most RUM tools give you raw data and leave the investigation to you. Laglog does the investigation for you, turning metrics into a clear issue description, affected pages, and prioritized fixes.
Pricing
Landing Page
$18/month
- 1 website
- Up to 10,000 page views/month
- 7-day data retention
- All Core Web Vitals (LCP, CLS, FCP, INP)
- Session analytics & issue detection
- Filtering by page, browser, device, OS
- Element-level attribution
- Performance trends & reports
- Email support (48h response)
Startup
$58/month
- Everything in Landing Page, plus:
- Up to 3 websites
- Up to 50,000 page views/month
- 30-day data retention
- Priority email support (24h)
Growth
$158/month
- Everything in Startup, plus:
- Up to 10 websites
- Up to 250,000 page views/month
- 90-day data retention
Enterprise
$398/month
- Everything in Growth, plus:
- Unlimited websites
- Up to 1,000,000 page views/month
- 1-year data retention
- Team access & SSO
- Dedicated account manager
Beyond monitoring
Automated insights. Expert guidance when you need it.
Every plan comes with real-time performance monitoring out of the box. Need more?