VS Code Built-in Terminal vs Secondary Terminal
A comprehensive comparison to help you understand when to use each terminal.
Core Capabilities
| Feature | VS Code Built-in | Secondary Terminal |
|---|---|---|
| Default scrollback | 1,000 lines (3,000 in latest) | 2,000 lines |
| Max scrollback | Unlimited (configurable) | 100,000 lines |
| Session persistence | No | Auto-save & restore |
| Max terminals | Unlimited | 10 (intentional design) |
| Terminal placement | Panel / Editor area | Sidebar + Panel |
AI Agent Integration
| Feature | VS Code Built-in | Secondary Terminal |
|---|---|---|
| CLI agent detection | No | Real-time detection (Claude, Copilot, Gemini, Codex) |
| Agent status display | No | Always-on indicators |
| Rendering optimization | Standard (60fps) | 250fps for AI agents (4x faster) |
| File reference sending | No | Cmd+Alt+L (insert @filename) |
| Multi-agent switching | No | One-click switching between agents |
| GitHub Copilot Chat | Built-in | Cmd+K Cmd+C (#file: format) |
UI/UX Features
| Feature | VS Code Built-in | Secondary Terminal |
|---|---|---|
| Alt+Click | Standard | With agent conflict detection |
| IME support | Standard | Enhanced (optimized for Japanese) |
| Split views | Standard | Dynamic direction (auto-adjusts) |
| Panel navigation | No | Zellij-style (Ctrl+P, h/j/k/l) |
| Tab drag & drop | Standard | With persistence (order saved) |
| Debug panel | No | Ctrl+Shift+D real-time monitoring |
| File links | Standard | Equivalent (src/app.ts:42:7) |
Performance
| Metric | VS Code Built-in | Secondary Terminal |
|---|---|---|
| Normal output | ~16ms/frame | ~16ms/frame |
| AI agent output | ~16ms/frame | ~4ms/frame (4x faster) |
| Bulk output (1000 lines) | ~500ms | ~400ms (20% faster) |
| Session restore | N/A | ~1000ms |
| Memory (5 terminals) | ~50MB | ~45MB (10% less) |
Storage Management
| Feature | VS Code Built-in | Secondary Terminal |
|---|---|---|
| Scrollback compression | No | gzip compression |
| Max storage | N/A | 20MB (configurable: 1-100MB) |
| Session retention | N/A | 7 days (auto-cleanup) |
| Progressive loading | N/A | Optional for large histories |
Configuration
| Aspect | VS Code Built-in | Secondary Terminal |
|---|---|---|
| Settings count | ~50 | 90+ |
| Shell profiles | Per-platform | Per-platform |
| TypeScript quality | N/A | 0 errors |
| Test coverage | N/A | 85%+ |
Use Case Recommendations
| Use Case | VS Code Built-in | Secondary Terminal | Recommendation |
|---|---|---|---|
| Normal terminal work | Excellent | Very Good | Either works well |
| Claude Code / AI agents | Basic | Excellent | Secondary Terminal |
| Multiple AI agents | Basic | Excellent | Secondary Terminal |
| Long-running sessions | Good | Excellent | Secondary Terminal |
| Sidebar-resident terminal | Limited | Excellent | Secondary Terminal |
| Many terminals (10+) | Excellent | Limited | VS Code built-in |
| File reference sharing | Good | Excellent | Secondary Terminal |
Summary
Secondary Terminal excels at
- AI Agent integration -- Dedicated optimization for Claude Code, Copilot, Gemini, Codex
- Session persistence -- Auto-restore after VS Code restarts
- Sidebar integration -- Dedicated panel with always-on access
- Performance -- Up to 4x faster rendering for AI agent output (250fps)
- File references -- One-key send to AI agents
- Scrollback -- 2x the default (2,000 lines)
VS Code built-in terminal excels at
- Unlimited terminals -- Open as many as needed
- Zero install -- Built-in, no extensions required
- Editor integration -- Display in editor area
- Official support -- Continuous improvements from the VS Code team
Recommended workflow
Use both terminals together for maximum productivity:
- Secondary Terminal for AI agent workflows and persistent sessions
- VS Code built-in terminal for general tasks and when you need many terminals