feelsfast

Educational platform on perceived performance — concepts, interactive scenarios, research-backed patterns, and an installable AI skill, for Product Designers, Design Engineers, and Frontend Engineers.

Live (when launched): feelsfast.fyi PRD: PRD.md

Why this exists

Web performance literature is bottom-heavy on metrics and top-heavy on motivational hand-waving. The middle layer — how a site is perceived to behave in time — is treated as folklore. feelsfast pulls the canonical thresholds (Miller 1968; Card et al. 1991; Doherty 1982; Nielsen 1993), the patterns that exploit them, the interactive demos that let you feel the difference, and an AI skill into one place.

Read PRD.md for the full plan: information architecture, content catalog (24 scenarios + 24 patterns), visual system, citation policy, and roadmap.

Stack

• Next.js 16 (App Router) + React 19 + TypeScript
• Tailwind CSS v4 + shadcn/ui
• MDX for content
• vitest + prettier
• Vercel hosting + Vercel Analytics

Develop locally

npm install
npm run dev

Open http://localhost:3000.

Scripts

• npm run dev — local development with Turbopack
• npm run build — production build
• npm run start — run the production build
• npm run lint — eslint
• npm run test — vitest
• npm run format — prettier write

License

• Code: MIT.
• Content (essays, patterns, scenarios): CC-BY 4.0 — added under content/LICENSE once content drafting begins.