March 2026 performance summary for badlogic/pi-mono focused on robustness and performance in reftable branch detection. Delivered a Reftable Branch Detection Enhancement that adds a fallback to git commands for invalid HEAD references, implements watcher-based updates for the reftable directory, and introduces caching optimizations to minimize unnecessary updates. This work improves reliability in multi-worktree and detached-head scenarios and ensures correct branch state resolution in commonGitDir worktrees. Also fixed edge cases in reftable footer branch detection and refined update notifications to only trigger on actual branch changes. Expanded test coverage with regression tests for fast-path operation (no spawnSync), nested cwd upward resolution, and churn suppression, resulting in a more deterministic and scalable detection pipeline.

2025-08 Monthly Summary for Shopify/dawn: Focused on delivering accurate cart performance metrics and closing a key measurement gap. Highlights include a targeted refactor to exclude debounce delays and background tab delays, preventing inflated P90 times and aligning with Horizon theme measurement practices. The work supports data-driven cart optimizations and consistent performance reporting across themes.