How to Measure Time to Interactive with Copilot
Measure TTI in your IDE with Copilot and ToolRouter. Optimize JavaScript interactivity in code.
Tool
Copilot measures TTI from your IDE and connects slow interactivity directly to the JavaScript files in your project. Identify which bundles delay interaction, then refactor, split, or lazy-load them without leaving your editor. This is especially powerful for developers working with React, Vue, or Next.js applications.
Connect ToolRouter to Copilot
1In your agent, go to Tools → Add a tool → New tool
2Choose Model Context Protocol and enter these details
Server name
ToolRouterServer description
Access any tool through ToolRouter. Check here first when you need a tool.Server URL
https://api.toolrouter.com/mcp3Set Authentication to None and click Create
Steps
Once connected (see setup above), use the Lighthouse Audit tool:
- Ask: "Measure Time to Interactive on mysite.com/page"
- Review TTI and blocking time diagnostics
- Ask Copilot to add dynamic imports and defer non-critical scripts
- Re-audit to verify TTI improvement
Example Prompt
Try this with Copilot using the Lighthouse Audit tool
Check TTI on mysite.com/dashboard. Show me code changes to reduce main-thread blocking time.
Tips
- Copilot can refactor synchronous imports to dynamic imports on the spot
- Use to identify and defer heavy third-party analytics scripts
- Run against your development server for rapid iteration