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Get Started Free →Use when auditing slow page loads, heavy assets, or rendering delays related to Use preconnect for critical third-party origins. Verify the actual bottleneck in DevTools, Lighthouse, or field data before recommending changes.
| Test case | Without → With | Effect | Δ tokens | Δ turns |
|---|---|---|---|---|
| case-18 | ✗→✓ | ▲ Improved | -14% | 0% |
| case-01 | ✓→✓ | ＝ Same ✓ | -10% | 0% |
| case-02 | ✓→✓ | ＝ Same ✓ | 27% | 0% |
| case-03 | ✓→✓ | ＝ Same ✓ | 9% | 0% |
| case-04 | ✓→✓ | ＝ Same ✓ | -8% | 0% |
Preconnecting to essential origins can shave hundreds of milliseconds off the critical path by handling connection overhead ahead of time.
Review the page's head for preconnect hints and identify any missing or unnecessary connections to third-party domains.
Add <link rel="preconnect"> for critical third-party origins and remove it for non-essential or underutilized domains.
Explain how preconnect helps reduce the time spent on connection overhead for third-party resources.
Review the routes, assets, and loading behavior that affect Use preconnect for critical third-party origins. 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/preconnect
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