statusline command causes high CPU usage (300%+) on startup

[Chachamaru127]

Environment

• ccusage version: 17.2.1 and 18.0.5
• OS: macOS Darwin 25.0.0 (Apple Silicon)
• Node: via bun x ccusage
• Claude Code: Multiple sessions

Problem

The ccusage statusline command causes extremely high CPU usage (300%+) when starting up, especially when multiple Claude Code sessions are open.

Steps to Reproduce

1. Configure statusline in ~/.claude/settings.json:

{
  "statusLine": {
    "type": "command",
    "command": "bun x ccusage statusline --visual-burn-rate emoji-text",
    "padding": 0
  }
}

2. Open multiple Claude Code sessions (e.g., 2-3 terminal tabs)
3. Each session spawns its own ccusage statusline process

Observed Behavior

• Each ccusage process consumes 100-400% CPU on startup
• Memory usage spikes to 1.5-2.4GB per process
• With 2 sessions: combined CPU usage reaches 600%+
• v17.2.1 eventually stabilizes (after ~30 seconds) to ~70% CPU
• v18.0.5 never stabilizes, stays at 300%+ indefinitely

Expected Behavior

• statusline should be lightweight and not cause noticeable CPU impact
• Multiple instances should coexist without resource contention

Workaround

Currently disabled statusline with "command": "echo ''" to avoid system slowdown.

Additional Context

• Running on Mac with 24GB RAM
• System Load Average jumped from 6.96 to 15.59 when ccusage was active
• No similar issues found in existing GitHub issues