# Claude Code CLI now uses 2x less CPU at p99

Bun’s garbage collector now waits until the process is idle instead of running on a fixed timer.

- The previous timer could trigger garbage collection mid-turn and take CPU when Claude Code was busiest.

## Why it matters

Claude Code CLI users now face lower peak CPU usage during active turns.

## Sources

- [Anthropic: Claude Code CLI now uses 2x less CPU at p99](https://x.com/ClaudeDevs/status/2089509659090780193)

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Summarized by dstilled on 2026-08-18. https://dstilled.ai/story/2be5f6d4-1140-4797-b8ab-a52d2ceaee01