Web Performance.

Web performance measurement, optimization, and monitoring. Covers 9 sub-skills.

• Web Performance · 1 of 3

  Core Web Vitals (LCP, INP, CLS)

  What does CLS measure?

  ANumber of CSS files loadedBTotal CPU time spent renderingCHow much visible content shiftsDHow long JavaScript takes to execute

• Web Performance · 2 of 3

  Browser Caching Strategies

  What response header enables conditional revalidation with resource fingerprints?

  AETagBLast-ModifiedCVaryDCache-Control: max-age

• Web Performance · 3 of 3

  Bundle Size & Code Splitting

  A third-party library does not support tree shaking (CommonJS). What techniques can minimize its impact on bundle size?

  ASet sideEffects: false for the package in your own package.jsonBImport only specific subpaths via a transform plugin or aliasCEnable optimization.usedExports which handles CommonJS tree shakingDConvert the library to ES modules locally using a polyfill