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Web performance optimization including bundle analysis, lazy loading, caching strategies, and Core Web Vitals
Passed 18 of 22 test cases with the skill, and 14 of 22 without it.
and 3 more in the full report
4 fixed14 passed either way4 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 4 test cases the skill fixed. Same model, same prompt, with and without the skill.
What is the recommended threshold for Largest Contentful Paint (LCP), and what two critical techniques optimize LCP for hero background/banner images?
| Checked | Without skill | With skill |
|---|---|---|
| Specifies LCP target threshold of under 2.5 seconds. | Passed | Passed |
| Recommends preloading hero image assets with fetchpriority set to high. | Missed | Passed |
The instructions your model reads when the skill loads.
// Dynamic import for route-level code splitting
const Dashboard = lazy(() => import("./pages/Dashboard"));
const Settings = lazy(() => import("./pages/Settings"));
function App() {
return (
<Suspense fallback={<PageSkeleton />}>
<Routes>
<Route path="/dashboard" element={<Dashboard />} />
<Route path="/settings" element={<Settings />} />
</Routes>
</Suspense>
);
}
// vite.config.ts - manual chunk splitting
export default defineConfig({
build: {
rollupOptions: {
output: {
manualChunks: {
vendor: ["react", "react-dom"],
charts: ["recharts", "d3"],
editor: ["@monaco-editor/react"],
},
},
},
},
});
# Analyze bundle composition
test cases passed, vs 14 / 22 without
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