Our approach to slow performance debugging

The Incident Triage Nightmare

It's 3 PM on a Friday. Your client calls: "The site feels slow. Can you check what's wrong?"

You open PageSpeed Insights, run a test, and see the performance score has dropped from 85 to 62. But why? The metrics show LCP is high, INP is poor, CLS is fine. You need to dig deeper, but where do you start?

You check the raw PageSpeed data, scroll through recommendations, try to correlate the issues. Maybe it's images? Or JavaScript? Could be a third-party script that was added recently. You're playing detective, and every minute you spend debugging is a minute your client's users are experiencing poor performance.

This is the slow performance debugging problem, and it's costing you credibility and revenue.

The Business Impact of Slow Debugging

When performance issues take too long to diagnose, the costs add up quickly:

Revenue Loss

• Every second of poor performance impacts conversion rates

• Studies show a 1-second delay can reduce conversions by 7%

• While you're debugging, potential customers are leaving

SEO Damage

• Google's Core Web Vitals directly impact search rankings

• Poor performance scores can take weeks or months to recover

• The longer issues persist, the deeper the ranking impact

Client Trust Erosion

• Slow response to performance issues damages your reputation

• Clients expect proactive monitoring, not reactive debugging

• Each incident that takes hours to resolve erodes confidence

Team Productivity Drain

• Developers pulled away from feature work to debug performance

• Context switching between tools and data sources

• Time spent on investigation instead of optimization

The Watcher Approach: Faster Diagnosis

We're building Watcher to turn slow debugging into faster diagnosis. Here's how:

Test Results with Context

When Watcher runs tests, you get more than a score:

• Metric breakdown for LCP, INP, CLS, and other Core Web Vitals

• Stored test history so you can see how metrics change over time

• Raw PageSpeed data when you need to dig deeper

• Recommendations from the test data to guide fixes

Budget Alerts That Record What Mattered

Watcher records budget violations as alerts so you have a clear audit trail:

• Which metrics exceeded your thresholds

• Which pages and strategies (mobile/desktop) are affected

• Test results linked to each alert for immediate context

Email and Slack notifications are on our roadmap so you'll be notified where you already work; until then, alerts are visible in the Watcher admin alongside your test history.

Integrations (Coming Soon)

We're building integrations with the tools you use:

• Email and Slack for alert notifications

• Webhooks for custom workflows

• API access for automation and headless dashboards

Example: From Violation to Fix

A typical flow with Watcher:

1. Budget is exceeded: Watcher records an alert (e.g. LCP over threshold on the homepage).

2. Review in Watcher: Open the site and page, see test results and when scores dropped.

3. Use the data: Check the metric breakdown and recommendations, identify the cause (e.g. a new unoptimized image).

4. Fix and confirm: Deploy the fix, run a new test from the admin, and confirm the improvement.

Everything stays in one place—no juggling multiple tools or dashboards.

Performance Budgets: Know When Thresholds Are Breached

Watcher's performance budget system lets you set thresholds per site and strategy:

• Set maximum values for LCP, INP, CLS, and other Core Web Vitals

• Get alerts recorded when budgets are exceeded

• Review which pages and metrics are affected from the admin

• Use budgets to focus optimization on what matters most

Historical Data for Smarter Debugging

Watcher stores test results over time so you can:

• See how metrics change across test runs

• Spot trends and regressions from the same place you view alerts

• Avoid re-downloading or re-running tests just to compare

We're adding comparison views and deployment correlation so you can tie changes to releases and build a clearer picture of what works.

What This Means for Your Workflow

With Watcher today, you can:

• See the full picture in one place: test results, budgets, and alerts in the admin

• Catch threshold breaches via recorded alerts and linked test data

• Use stored history to see when scores dropped and what changed

• Scale monitoring across multiple sites without juggling multiple tools

The Future of Performance Diagnostics

As we continue building Watcher, we're adding capabilities that will make debugging even faster:

• Email and Slack notifications for budget violations

• AI-assisted root cause analysis

• Correlation with deployment history

• CI/CD integrations for pre-deployment checks

• Predictive alerts based on trend analysis

The goal is to make performance debugging so fast and accurate that issues are resolved before users notice them.