website issue monitoring
See when request timing or page loading gets slower.
Visual Sentinel tracks regional response timing on each uptime cycle and stores a daily mobile Lighthouse lab result, so you can compare request slowdowns with loading regressions.
Your first check is free when you add your site. Then try a paid plan for 7 days (card required) or subscribe, from $15 USD a month.
definition
What Is Website Performance Monitoring?
Website performance monitoring compares request timing and page-loading evidence over time. Visual Sentinel stores regional response time on each uptime cycle, including DNS, connection, TLS, first-byte, and download phases when the check node supplies them. Paid HTTP monitors also receive a scheduled mobile Lighthouse lab run each day with LCP, FCP, CLS, TTFB, Total Blocking Time, Speed Index, and a performance score. These are diagnostic lab measurements, not a substitute for real-user Core Web Vitals field data from Google Search Console or Chrome UX Report.
what you get
Built for issues customers actually notice.
Response Time Tracking
Track HTTP response times with every check. See trends over hours, days, and weeks to spot degradation early.
Slowdown Alerts
Get notified when response times exceed your thresholds. Fix performance issues before users start complaining.
Performance Trends
Historical charts show how your site performance changes over time. Correlate deployments with speed changes.
Detailed Reports
Business and Agency can include supported performance evidence in scheduled reports for teams or clients.
Two Useful Cadences
Request timing follows the uptime interval. Mobile Lighthouse lab results run daily on paid monitors.
Part of 6-Layer Monitoring
Paid plans keep performance evidence beside uptime, SSL, DNS, and eligible visual or content checks in the same monitor.
how it works
Three steps, no extensions.
Add Your URL
Enter your website URL. We start collecting performance data immediately.
Set Speed Thresholds
Define what "slow" means for your site. Get alerted when response times exceed your limits.
Optimize with Data
Use performance trends and reports to identify and fix bottlenecks.
Frequently asked questions
What performance metrics do you track?
Each uptime cycle records total response time and available DNS, connection, TLS, first-byte, and download phases. Paid monitors also receive a daily mobile Lighthouse lab result with performance score, LCP, FCP, CLS, TTFB, Total Blocking Time, and Speed Index.
Can I set custom performance thresholds?
Yes. You can define response-time and supported Lighthouse lab thresholds per monitor. Regional slow-response checks and scheduled lab results use different execution paths, so the dashboard labels the source and cadence.
How does this help my SEO?
The lab result helps you spot loading regressions, but it does not replace real-user Core Web Vitals data. Use Google Search Console or Chrome UX Report field data for the ranking-related assessment, then use Visual Sentinel timing and lab evidence to investigate changes.
start with a first check
Check Your Site Free on your own site.
Your first check is free when you add your site. Then try a paid plan for 7 days (card required) or subscribe, from $15 USD a month.
- free first check
- 7-day trial, card required
- 14-day money-back guarantee