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google-labs-jules[bot]andPR0M3TH3AN
5e1709b900
Replaces the O(N) getBoundingClientRect polling loop in the docs scroll spy with an IntersectionObserver. This eliminates potential layout thrashing and reduces main thread CPU usage during scrolling.
- Replaces `window.addEventListener("scroll")` with `IntersectionObserver`.
- Maintains active section state using `passedHeadings` set.
- Updates `setupScrollSpy` and `clearScrollSpy` to manage the observer.
- Preserves existing behavior where the active section is the last one that has passed the top offset (96px). Note: Activation now occurs when the header *fully* exits the top offset area, which is a minor behavior change (delayed by header height) but improves performance and stability.
Co-authored-by: PR0M3TH3AN <[email protected]>