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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.
Passed 22 of 22 test cases with the skill, and 21 of 22 without it.
1 fixed21 passed either way0 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
This benchmark measured an earlier version of the skill.
A test case the skill fixed. Same model, same prompt, with and without the skill.
A developer is adding early connection hints to a site. They have identified 1 critical API and 1 critical font provider. Is this within the recommended threshold, and what is the minimum recommended number of critical origins to target?
| Checked | Without skill | With skill |
|---|---|---|
| Specifies 2 as the minimum recommended number | Missed | Passed |
The instructions your model reads when the skill loads.
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/rules/performance/preconnect
test cases passed, vs 21 / 22 without
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