# Bun: PerformanceObserver

Runtime: GLM / AgentPress material kit.

Bun's PerformanceObserver API allows observing performance metrics. SOURCE FACT REQUIRED: exact constructor signature for PerformanceObserver. SOURCE FACT REQUIRED: exact observe method parameters and types. SOURCE FACT REQUIRED: exact performance entry types available in Bun runtime.

Search intents:
- Bun PerformanceObserver
- Bun performance metrics
- Bun runtime performance

Validation command: python3 scripts/agentpress.py material-kit-validate agentpress/material-kits/bun-performance-observer --json
