Solution

Web application performance monitoring

Response-time tracking, Core Web Vitals checks, and regression alerts. Catch slowdowns the moment they show up — before SEO and conversion take a hit.

Start free trial How it works

Web performance monitoring tracks response times, page-load metrics, and Core Web Vitals across the pages that matter most. Slowdowns rarely happen all at once — they creep in through a JavaScript bundle that grew 30%, a third-party tag that got slower, or a database query that got heavier. WebMonitor.fyi tracks performance per-monitor and fires regression alerts when metrics drift outside the band you set.

What it does

Response-time tracking

Per-monitor response-time history. Catch the page that's gradually creeping from 1.2s to 2.4s.

Core Web Vitals checks

LCP, INP (replacing FID), and CLS — the metrics Google uses for ranking. Track them on your high-traffic SEO pages.

Regression band alerts

Set a baseline and a tolerance band. Get alerted only when a real regression happens, not every time response time wobbles by 50ms.

Multi-region timing

Performance varies by region. Track from multiple geographies to catch CDN issues and regional slow points.

How to set it up

Pick the pages worth tracking

High-traffic SEO landing pages, the homepage, key conversion-funnel pages, primary API endpoints.

Set a performance baseline

Run for a week to establish the normal range, then set a tolerance band (e.g., "alert me if LCP goes above 2.5s for 3 consecutive checks").

Configure alerts

Slack for awareness; PagerDuty if the regression crosses a hard threshold.

Review the trends

Weekly trend reports surface gradual regressions that single-check alerts miss.

Common use cases

SEO teams tracking Core Web Vitals on ranking-critical pages
Engineering teams catching post-deploy regressions
Marketing teams monitoring landing-page speed during paid campaigns
Operations teams tracking third-party tag impact on load times
Product teams monitoring conversion-funnel page speed

Honest limits

Performance monitoring tracks what an external HTTP request sees. Real-user monitoring (RUM) — what actual users in actual browsers experience — is complementary and not covered by an external monitor. For full performance coverage, pair external monitoring with a RUM tool.

Frequently asked questions

Does this measure Core Web Vitals the same way Google does?

Lab measurements (what an external monitor sees) and field measurements (what real users see, what Google ranks on) are different. WebMonitor lab measurements correlate with field data and catch most regressions, but for the exact field numbers Google uses, check the Search Console Core Web Vitals report.

Can I monitor specific transactions, like a checkout flow?

Multi-step transactional monitoring (login → add to cart → checkout) is a deeper synthetic monitoring use case. WebMonitor covers single-page performance checks; full transactional synthetic monitoring is on the roadmap.

How does this compare to Datadog Synthetics or Catchpoint?

Those are full-stack performance monitoring platforms with deeper APM integration. WebMonitor is the alerting layer for performance — useful when you want lightweight performance signal without the platform overhead.