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The 60-second status bar poll (readAllUsage) and the burn-rate prediction (readRecentCosts) read and parsed every session file under ~/.claude/projects/ on each pass, including months-old history that cannot affect any aggregation window. - findAllJsonlFiles() now takes an optional mtime cutoff (epoch ms); session files are append-only, so a file not modified since T cannot contain entries with timestamps after T - readAllUsage skips files untouched for over 7 days (+1h margin) - readRecentCosts skips files untouched for over its 30-min window (+60s margin) - wasJsonlUpdatedRecently rewritten on top of the same filter - Unit tests for the filter (temp HOME with fresh + backdated files) - docs/DATA.md: new mtime-based file skipping section Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_012ZLCLQeudf1LQBnBSyyr4f
This was referenced Jul 7, 2026
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Summary
The 60-second status bar poll (
readAllUsage) and the burn-rate prediction (readRecentCosts) read and parsed every session file under~/.claude/projects/on each pass — including months-old history that cannot affect any aggregation window. On installations with a long Claude Code history this is the dominant cost of the poll loop.Approach
findAllJsonlFiles()gains an optionalnewerThanMscutoff that skips files whosemtimeis older. This is safe for time-windowed aggregation because session JSONL files are append-only: a file not modified since time T cannot contain entries with timestamps after T. Every cutoff keeps a safety margin.readAllUsage(60s poll, widest window 7d)now − 7d − 1hreadRecentCosts(burn rate, 30-min window)window start − 60swasJsonlUpdatedRecentlyThe heatmap already had an equivalent mtime filter (0.4.x); this brings the remaining readers in line.
Tests / Docs
HOMEwith a fresh file and a 10-day-backdated file (fs.utimes), asserting unfiltered vs. filtered results andwasJsonlUpdatedRecentlybehaviour.docs/DATA.md: "mtime-Based File Skipping" section with the caller/cutoff table and the always-keep-a-margin rule.CHANGELOG.md: Unreleased → Performance entry.npm run lint✅,npm run compile✅, unit suites (37 tests) ✅ via mocha. The@vscode/test-electronrunner cannot download VS Code in this sandbox; please rely on CI for the extension-host suites.🤖 Generated with Claude Code
https://claude.ai/code/session_012ZLCLQeudf1LQBnBSyyr4f
Generated by Claude Code