[OptimistOtaku]

GPUI's Whisper and Parakeet caption paths pass owned word vectors to normalize_caption_words, which allocates a second vector and copies every retained word's text. Normalize the existing vector and strings in place, then attach punctuation before applying the existing duration cap.

This retains Unicode trimming, leading/consecutive punctuation, word order, start/end float bits, caption text, and chunk boundaries. Punctuation may still grow the preceding string. No dependencies, public API, project format, or platform-specific code change.

Measurements

Native Windows x86_64, Ryzen 5 5600H, Rust 1.88 GNU, repository release profile (opt-level=s, thin LTO). Median of nine alternating paired samples after warmups. Input batches are cloned before the timer; timings include normalization and dropping the complete output. The benchmark compares the exact upstream function against production code and checks full output equivalence before timing.

Input words	Whitespace padding	Before	After	Speedup
32	No	2.233 µs	1.623 µs	1.38×
32	Yes	2.422 µs	1.356 µs	1.79×
1,000	No	94.226 µs	66.918 µs	1.41×
1,000	Yes	86.839 µs	52.445 µs	1.66×
12,000	No	1.151 ms	0.715 ms	1.61×
12,000	Yes	1.021 ms	0.533 ms	1.92×

A second complete run also improved every case. These are normalization timings, excluding speech recognition, model loading, and UI work.

cargo test --locked -p cap-project --release --lib benchmark_caption_word_normalization -- --ignored --nocapture

Validation

• cargo fmt --all, cargo check --locked -p cap-project
• cargo test --locked -p cap-project: 196 library tests and four integration tests passed; five benchmarks ignored by default, new benchmark run separately.
• cargo clippy --locked -p cap-project --all-targets -- -D warnings
• git diff --check

Differential cases cover Unicode/ASCII whitespace, empty tokens, punctuation chains, multilingual text, signed zero, NaN/infinite times, duration clamping, rendered text, and grouping. A separate test verifies reuse of vector and string allocations. Native GPUI launch is unverified locally. Fork Actions dispatch is disabled by GitHub; upstream PR CI will provide additional platform validation.

Confidence Score: 5/5

The PR appears safe to merge; no actionable issues were found.

Summary

Changes normalize_caption_words to reuse the owned vector and strings instead of copying retained words.

• Caption words are trimmed and joined in place before they become caption segments.

_{Reviews (1) · Last reviewed commit: "perf(project): normalize caption words i..." · Reviewed by Greptile}

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