[OptimistOtaku]

Playback and export call cursor_visibility_at for every frame. When a project contains hidden-cursor clips, it constructs and drops a vector of every hidden run just to select the run containing that frame.

Merge runs while retaining the first matching window and the total clip duration, using fixed stack storage. The complete traversal remains necessary for fades at the timeline's end. Fullscreen-hold mapping, transition arithmetic, adjacent-run merging, exclusive end boundaries, and fade calculations retain their previous behavior. The small no-hidden-clips entry path is kept separate from the heavier implementation.

Measurements

Windows x86_64, Ryzen 5 5600H, Rust 1.88 GNU, repository release profile (opt-level=s, thin LTO). Nine alternating paired samples after warmups, each with 10,000 varying frame times. The ignored benchmark compares the exact previous functions with production code and checks complete float-bit equivalence before timing.

Clips	Hidden clips	Transitions	Holds	Before (ns)	After (ns)	Speedup
2	None	No	No	3.33	3.07	1.08×
2	All	No	No	58.01	17.94	3.23×
2	Mixed	No	No	69.65	20.46	3.40×
2	Mixed	Yes	No	75.80	25.36	2.99×
2	Mixed	Yes	Yes	141.38	94.25	1.50×
20	None	No	No	9.82	15.37	0.64×
20	All	No	No	128.95	83.50	1.54×
20	Mixed	No	No	196.30	88.34	2.22×
20	Mixed	Yes	No	305.81	203.31	1.50×
20	Mixed	Yes	Yes	530.48	434.08	1.22×
200	None	No	No	90.84	108.05	0.84×
200	All	No	No	892.96	790.40	1.13×
200	Mixed	No	No	1,176.43	848.08	1.39×
200	Mixed	Yes	No	3,116.00	2,863.57	1.09×
200	Mixed	Yes	Yes	5,931.31	5,729.84	1.04×
1,000	None	No	No	568.59	616.30	0.92×
1,000	All	No	No	5,378.99	4,777.59	1.13×
1,000	Mixed	No	No	5,660.08	4,880.92	1.16×
1,000	Mixed	Yes	No	21,384.78	20,603.92	1.04×
1,000	Mixed	Yes	Yes	40,407.80	42,132.87	0.96×

The benefit is concentrated in hidden-clip projects without large transition/hold workloads. No-hidden controls cost approximately 6–48 ns more in the larger fixtures; the 1,000-clip transition/hold control was about 4% slower. A second complete run retained the hidden-clip gains and that largest control's regression. Hold-window allocation and full clip traversal remain. These measure cursor visibility CPU work, excluding GPU rendering and overall FPS.

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

Validation

• cargo fmt --all, cargo check --locked -p cap-project
• cargo test --locked -p cap-project --lib --tests: 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 tests cover every hidden/visible pattern through six clips, fractional speeds, transitions, overlapping fullscreen holds, exact fade/window boundaries and neighboring representable timestamps, empty timelines, degenerate clips, and non-finite inputs. No dependencies, platform-specific code, persistent caches, or project-format changes. The native GPUI app was not launched locally. This branch is independent of #3436.

Confidence Score: 5/5

The PR appears safe to merge.

Summary

Replaces the allocated list of hidden-cursor runs with one matching run while preserving the total duration.

• Hidden-cursor checks find their window without building a list.

_{Reviews (1) · Last reviewed commit: "perf(project): resolve hidden cursor win..." · Reviewed by Greptile}

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