Module 22: Web Performance

MODULE 22 · 2 LESSONS

Measure user-visible latency and optimize the largest bottleneck across browser, network, server and database.

Project checkpoint: Create a before-and-after performance budget for CourseFlow.

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Module 22 learning loopA four-step visual showing LCP, INP, CLS, performance budgets.Module 22 learning loop1LCP2INP3CLS4PerformanceBudgets

Module 22 learning loop

  1. 1LCP
  2. 2INP
  3. 3CLS
  4. 4Performance Budgets
Module 22 learning loop: a practical sequence used in this lesson.

What this module changes in your work

  • Reduce render delay, unstable layout and unnecessary JavaScript using field-aware measurements.
  • Use traces and query plans to remove expensive work instead of guessing.
  • Use LCP, INP, CLS in one coherent implementation.
  • Complete this evidence-backed checkpoint: Create a before-and-after performance budget for CourseFlow.

Lessons

PROJECT CHECKPOINT

Turn web performance into evidence

Create a before-and-after performance budget for CourseFlow.

  • Write acceptance criteria for LCP before implementation.
  • Keep the change small enough that a reviewer can connect it to the intended behavior.
  • Use the most direct check available for INP and save the result.
  • Record one decision you would keep and one you would revisit after feedback.

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