From 1362f00d39e90aef8a8338887222541a5a992178 Mon Sep 17 00:00:00 2001 From: Claude Date: Wed, 18 Feb 2026 21:52:21 +0000 Subject: Fix theme performance regressions affecting mobile scroll 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 --- frontend-vanilla/public/themes/sakura.css | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'frontend-vanilla/public/themes/sakura.css') diff --git a/frontend-vanilla/public/themes/sakura.css b/frontend-vanilla/public/themes/sakura.css index f0fc990..48a1c0a 100644 --- a/frontend-vanilla/public/themes/sakura.css +++ b/frontend-vanilla/public/themes/sakura.css @@ -57,7 +57,8 @@ body { background-color: var(--bg-color); color: var(--text-color); -webkit-font-smoothing: antialiased; - text-rendering: optimizeLegibility; + /* text-rendering: optimizeLegibility removed -- causes expensive text + shaping on all content, leading to scroll jank on mobile. */ } /* ---- Sidebar ---- */ -- cgit v1.2.3