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…stant feedback Measured first (Chromium, 4x CPU throttle, WebGL field forced on), then fixed the causes: - The fixed WebGL field behind every page re-rendered at 60 fps whenever the pointer moved, so the GPU was busiest exactly while visitors hovered. It now renders one still frame (redrawn on resize only); 3D sigils likewise. - No backdrop blur over content that moves: the sticky header and glass panels use translucent solids; the menu backdrop blur is lighter. - Homepage hero: the colour grade and dimming are baked into new v2 clips and posters (mean difference 1-2/255), removing a per-frame CSS filter, opacity and blend mode over a full-screen video; the entrance is shorter and has no blur. - Reveals: 360-420 ms, transform and opacity only, smaller stagger. - Magnetic buttons removed (targets no longer move under the cursor). - Interaction layer: 100 ms hover, 60 ms press feedback on buttons and links, focus rings, touch-action manipulation, hover only where hover exists; every visible control now changes on hover (automated audit). - Same-site links prerender after a short hover (Speculation Rules) and pages crossfade (cross-document View Transitions). Result (p95 frame time / worst interaction, before -> after): factory 100 ms / 3280 ms -> 16.7 / 32; attest 217 / 688 -> 16.8 / 40; rise 350 / 1144 -> 33 / 120; flyspace 267 / 2824 -> 16.8 / 56; plus 33 / 3360 -> 16.8 / 40; home 67 / 760 -> 33 / 88. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01VHrJ4fbaWysbQJ2TrSq6FB
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What
Hover and click felt slow. I measured first, under Chromium with a 4x CPU throttle and the WebGL background forced on, then removed the causes.
With the background turned off, every static page was already smooth. That isolated the cause.
Changes
backdrop-filterover moving content and use translucent solids instead.Checks
scripts/*.test.mjs: 32 pass.server/test: 208 pass.pnpm build:siteplus all "Prepare public site" assertions.scripts/qa.mjs: the only error is the staff worker bundle, which a later step builds.Generated by Claude Code