Chat Performance Testing

When to use

• Before/after modifying chat rendering code (chatListRenderer.ts, chatInputPart.ts, markdown rendering)
• When changing the streaming response pipeline or SSE processing
• When modifying disposable/lifecycle patterns in chat components
• To compare performance between two VS Code releases
• In CI to gate PRs that touch chat UI code

Quick start

# Run perf regression test (compares local dev build vs VS Code 1.115.0):
npm run perf:chat -- --scenario text-only --runs 3

# Run all scenarios with no baseline (just measure):
npm run perf:chat -- --no-baseline --runs 3