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The new theme CSS files introduced several patterns that cause
scroll jank and memory pressure, especially on mobile:
- terminal.css: Full-viewport fixed pseudo-element with repeating
gradient scanlines forced GPU compositing on every scroll frame.
Now limited to desktop only with will-change layer promotion.
- codex.css/sakura.css: text-rendering: optimizeLegibility on body
triggered expensive kerning/ligature computation on all text.
- codex.css: font-feature-settings forced text shaper on every glyph.
- codex.css: hyphens: auto required dictionary lookups during layout.
- style.css: transition: all on buttons and sidebar links caused
unnecessary animation work during scroll hover state changes.
- main.ts: checkReadItems did O(n) individual querySelector calls
per scroll tick; switched to single querySelectorAll batch query.
- Polling interval reduced from 1s to 3s (scroll handler already
covers the normal case, polling is just a robustness fallback).
https://claude.ai/code/session_0187FXrbScDSWfbNEk9SfJaj
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