When referring to the critical rendering path in site performance, a critical resource is:

When referring to the critical rendering path in site performance, a critical resource is:
1:-any resource that returns 404
2:-a resource that could block initial display of the page
3:-any resource that must be loaded
4:-a resource that takes more than 500ms to load

Correct answer is:

a resource that could block initial display of the page.
Explanation: A critical resource is a resource that could block initial rendering of the page. The fewer of these resources, the less work for the browser, the CPU, and other resources.

When referring to the critical rendering path in site performance, a critical resource is:
When referring to the critical rendering path in site performance, a critical resource is:

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