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Get Started Free →Use when auditing slow page loads, heavy assets, or rendering delays related to Optimize third-party script loading. Verify the actual bottleneck in DevTools, Lighthouse, or field data before recommending changes.
| Test case | Without → With | Effect | Δ tokens | Δ turns |
|---|---|---|---|---|
| case-13 | ✗→✓ | ▲ Improved | 8% | 0% |
| case-15 | ✗→✓ | ▲ Improved | 2% | 0% |
| case-02 | ✓→✗ | ▼ Worse | 0% | 0% |
| case-01 | ✓→✓ | ＝ Same ✓ | -5% | 0% |
| case-03 | ✓→✓ | ＝ Same ✓ | 20% | 0% |
Third-party scripts are the #1 cause of slow websites—unoptimized loading can add 2-5 seconds to your page load time.
Analyze third-party scripts on this page to ensure they use async/defer and don't block rendering.
Add async or defer attributes to third-party scripts and consider lazy loading non-critical scripts.
Explain the performance impact of third-party scripts and strategies to minimize their blocking effect.
Review the routes, assets, and loading behavior that affect Optimize third-party script loading. 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/third-party-scripts
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