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AI agent for website developers

Page Performance Regression Agent

Key pages stay within performance budgets after every release

MonitoringQuality controlIT and developmentCreatives
See how it worksGet access
Page Performance Regression Agent: what goes in, what the agent does and what you get

What it does

Websites get slower one release at a time, and no one notices until visitors leave. After each deploy and every night, this agent runs speed tests on key pages several times, measuring load time, layout shift and response speed on mobile and desktop. It uses the median of at least three runs so a slow test server does not trigger false alarms. When a page goes over its budget, it compares assets and scripts between the old and new builds to find the cause, such as a large image or a new script. It drafts a fix and tests it on staging. Then it checks the fix actually brings the page back under budget. If not, it looks for the next cause. A developer approves every change. Edge case: results that swing because of a slow test server are rerun before anything is flagged.

How it works

Follow the arrows from top to bottom. The orange dashed arrow is the loop: when a check fails, the agent goes back and tries again.

Start and resultWhat it doesA check on its own workWaits for your OKGoes back and retries
Yes, continueYes, continueApprovedNoNo 1 STARTS WHEN Deploy finishes 2 USES A TOOL Run speed tests on key pages several times 3 CHECKS THE RESULT Are the medians within budget? If not: rerun to rule out noise, then continue todiagnose. Back to step 2. 4 DOES Compare assets and scripts between builds 5 USES A TOOL Draft a fix and test it on staging 6 CHECKS THE RESULT Does the fix bring the page back under budget? If not: look for the next cause and draft another fix.Back to step 4. 7 YOU APPROVE Developer approves the change 8 RESULT Performance report and fix
Read the steps as a list
  1. Deploy finishes
  2. Run speed tests on key pages several times
  3. Are the medians within budget?If not: rerun to rule out noise, then continue to diagnose. Back to step 2.
  4. Compare assets and scripts between builds
  5. Draft a fix and test it on staging
  6. Does the fix bring the page back under budget?If not: look for the next cause and draft another fix. Back to step 4.
  7. Developer approves the changeThe agent waits here for your OK.
  8. Performance report and fix

How it decides

It flags a page only when the median of several runs breaks the budget or worsens past the threshold.

  • Use the median of at least three runs
  • Flag new scripts above the size limit
  • Prioritize pages with the most traffic

Make it yours

Every agent is a starting point. You choose these settings for your own situation.

  • Performance budgets per page
  • Pages to watch
  • Runs per test (default 3)
  • Alert channel

What keeps you in control

It always asks you first

  • Merging performance fixes
  • Removing third-party scripts

Hard limits

  • Never removes features without approval
  • Tests on staging first

It stops when

  • Done: pages back in budget
  • Stop: cause is a third-party script the team does not control; report

Set it up

We guide you through the set-up, step by step

Members get the full set-up guide for this agent. No technical skills needed: you copy, paste and upload.

10 minto set it up in your AI
5 AIsChatGPT, Claude, Copilot, Gemini, Grok
  • One set of instructions to paste into your AI, with the clicks for ChatGPT, Claude, Microsoft 365 Copilot, Gemini and Grok
  • The agent then walks you through connecting your own data, one source at a time
  • A downloadable copy with the flow chart, the rules and the full guide
Get access to this agent

An example run

What happensAfter a release on June 9, the product page's mobile load time rose from 2.1 to 3.4 seconds in all three runs. The agent found a 900 KB hero image without compression and a new chat script. It compressed the image and tested on staging: 2.8 seconds, still over the 2.5-second budget. It then lazy-loaded the chat script, reaching 2.2 seconds. The developer approved both changes.

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