AcBun's garbage collector waits for idle in Claude Code
Mid-turn, the CLI was losing CPU to its own runtime: Bun's garbage collector ran on a fixed timer, so it kicked in right when Claude Code was busiest. The GC now holds off until the process is idle, and the perf note claims 2x less CPU at p99.
The note doesn't name the Claude Code release carrying the change. Claude Code has run on the Rust port of Bun since v2.1.181, which shipped June 17.