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Get Started Free →Use when auditing slow page loads, heavy assets, or rendering delays related to Use secure and up-to-date JS libraries. Verify the actual bottleneck in DevTools, Lighthouse, or field data before recommending changes.
| Test case | Without → With | Effect | Δ tokens | Δ turns |
|---|---|---|---|---|
| case-06 | ✗→✓ | ▲ Improved | 2% | 0% |
| case-20 | ✗→✓ | ▲ Improved | -5% | 0% |
| case-01 | ✓→✓ | ＝ Same ✓ | 4% | 0% |
| case-02 | ✓→✓ | ＝ Same ✓ | 2% | 0% |
| case-03 | ✓→✓ | ＝ Same ✓ | -9% | 0% |
Outdated or vulnerable libraries pose security risks and often include unnecessary bloat that degrades performance.
Check the project's JavaScript dependencies for known vulnerabilities and outdated versions.
Update vulnerable libraries to secure versions and replace bloated dependencies with modern, lightweight alternatives.
Explain the risks of using outdated JavaScript libraries and the benefits of using lightweight alternatives.
Review the routes, assets, and loading behavior that affect Use secure and up-to-date JS libraries. Flag exact files, requests, or rendering steps that add unnecessary network, CPU, or layout cost, and describe the measurement method used to confirm the issue.
For full implementation details, code examples, and framework-specific guidance, see references/rule.md.
Rule page: https://frontendchecklist.io/en/rules/performance/js-libraries
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