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System Design Masterclass · Web Content Delivery
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A marketing team launched a redesigned homepage. Full-screen background video, animated SVGs, four custom fonts, twelve high-resolution product images. The page weighed 15MB. On a good connection, first paint took 4 seconds. On mobile 3G, users stared at a white screen for 30 seconds.
Google's Core Web Vitals failed across the board. Within a month, search rankings dropped 40%. The page looked beautiful but nobody waited long enough to see it.
The fix was not removing content. It was optimizing delivery: compressing files, splitting code, hashing filenames for long-lived caching, and serving from edges. The same page, same visuals, but the initial load dropped from 15MB to 800KB. First paint under 1.5 seconds on 3G.
Static assets (JavaScript, CSS, images, fonts) are the raw materials of every web page. How you build, compress, cache, and deliver them determines whether your page loads in 1 second or 10.
Every modern web application runs source files through a build pipeline before deployment. The pipeline transforms human-readable source code into optimized delivery artifacts.
Transpilation: TypeScript becomes JavaScript. Modern syntax (optional chaining, nullish coalescing) compiles to older syntax for browser compatibility. JSX transforms into function calls.
Bundling: Hundreds of source files merge into a handful of bundles. The bundler (Vite, esbuild, webpack) resolves imports, eliminates dead code (tree shaking), and produces output files grouped by route or feature.
Minification: Whitespace removed, variable names shortened, dead branches eliminated. A 500KB source file becomes 180KB minified. Terser (for JS) and cssnano (for CSS) are the standard tools.
Content hashing: Each output file gets a hash of its contents appended to the filename: main.a3f2b1.js. When the file changes, the hash changes. When it does not change, the browser uses the cached version forever. This is the foundation of cache-busting.
Vite produces builds in 200-400ms for most applications. Webpack takes 5-30 seconds. The build speed does not matter for users, but it matters for developer productivity and pipeline duration.