Chat Performance Testing When to use - Before/after modifying chat rendering code ( , , 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 Perf regression test Script: npm: Launches VS Code via Playwright Electron, opens the chat panel, sends a message with a mock LLM response, and measures timing, layout, and rendering metrics. By default, downloads VS Code 1.115.0 as a baseline, benc…