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# Objective Land five small, independent performance fixes found during an audit of hot paths (anchor resolution, line shaping, worktree scanning, and sorting in multibuffers). ## Solution Each fix is its own commit, so **this PR is best reviewed commit-by-commit** — every commit message contains the full reasoning for that change: - `text`: Avoid redundant rope traversal in `Anchor → usize` conversion — call `offset_for_anchor` directly instead of `summary_for_anchor`, which recomputed the same byte offset with ~4 extra O(log n) tree walks. This is the hottest anchor-resolution path. - `editor`: Avoid double allocation per shaped line — `line.as_str().into()` instead of `line.clone().into()`, which allocated twice per visible line, every frame. - `text`: Use `sort_unstable_by_key` in operation queue insertion — Lamport timestamps are unique keys and duplicates are deduped right after, so stability buys nothing. - `multi_buffer`: Sort with an explicit comparator instead of `sort_unstable_by_key`, which cloned a `PathKey` (`Arc` refcount bump) on every comparison. - `worktree`: Replace O(n²) `Vec::remove` in the deferred-directory pass with an O(1) `None` assignment — the vec is already `Vec<Option<ScanJob>>` and is consumed with `.flatten()`. ## Testing - No behavior changes intended; all changes are mechanical and tests affected crates pass: `text`, `editor`, `multi_buffer`, `worktree`. ## Self-Review Checklist: - [x] I've reviewed my own diff for quality, security, and reliability - [x] Unsafe blocks (if any) have justifying comments - [x] The content adheres to Zed's UI standards ([UX/UI](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist) and [icon](https://github.com/zed-industries/zed/blob/main/crates/icons/README.md) guidelines) - [x] Tests cover the new/changed behavior - [x] Performance impact has been considered and is acceptable --- Release Notes: - Improved editor performance through several micro-optimizations in anchor resolution, line shaping, and worktree scanning. |
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