Evidence review
What to inspect before changing anything
Start with the delivered website and the real user journey. Record the current state so the team can distinguish an observed problem from an assumption and compare the same surface after deployment.
- 01Inspect route and shared bundle composition
- 02Find libraries used for small features
- 03Measure unused code and main-thread tasks
Implementation
A practical improvement plan
Make the smallest coherent change that solves the observed problem. Keep normal code review, accessibility, security and product checks in the loop instead of optimizing for the scan alone.
- 01Remove or replace low-value dependencies
- 02Split code at meaningful interaction boundaries
- 03Keep server-only logic out of client bundles
Verification
How to verify the result
Verification should test the intended outcome and the most likely regression. Use the production delivery path whenever headers, caching, rendering or third-party services affect the result.
- 01Profile cold and warm loads on a modest device
- 02Compare interaction latency
- 03Set route-level budgets in CI
Common pitfall
A shortcut to avoid
Chasing the smallest byte count can create fragmented loading and maintenance complexity without improving user experience.
Further reading
Primary guidance and references
These sources provide standards, security guidance or the interpretation framework used to keep this guide bounded. Product-specific implementation still requires review in the actual codebase.