[WIP] Identify and suggest improvements for inefficient code

[Copilot]

Performance Improvements Plan

• Optimize WebUI.wait() polling loop - reduce frequency to 250ms for lower CPU usage
• Optimize show() and showBrowser() connection waiting - exponential backoff for early connections
• Cache nightly version hash to avoid repeated HTTP requests
• Remove redundant exists() check before mkdir in utils.ts
• Optimize deps.ts top-level await to be lazier (defer library download until first use)
• Add buffer reuse for script() and scriptClient() methods to reduce memory allocations
• Run code review and security scan before completion

Original prompt

Identify and suggest improvements to slow or inefficient code

---

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.