high severityGitHub Copilot VS Code extension
GitHub Copilot autocomplete, chat responses, and agent mode become extremely slow (10+ minutes for simple suggestions, slow token streaming/"painting" back responses); persists across restarts/projects; makes tool unusable. [microsoft/vscode-copilot-release #6489](https://github.com/microsoft/vscode-copilot-release/issues/6489)
Root cause
Accumulation of bloated or corrupted temporary cache files in VS Code, leading to performance degradation over time as suspected memory leaks or cache buildup interfere with Copilot's response processing and chat rendering. [microsoft/vscode-copilot-release #6489](https://github.com/microsoft/vscode-copilot-release/issues/6489)
github-copilotvscodelatencycacheperformance-degradation