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.
- 01Measure inline script volume and purpose
- 02Identify data blobs, configuration and executable code
- 03Check CSP requirements and cache duplication
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.
- 01Move stable logic to versioned modules
- 02Serialize only the data needed for hydration
- 03Use nonces or hashes for unavoidable inline code
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.
- 01Compare startup behavior and cache hits
- 02Enforce the intended CSP
- 03Test navigation and hydration after extraction
Common pitfall
A shortcut to avoid
Extracting tiny critical boot code into another blocking request can reduce security flexibility while hurting performance.
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.