Critical request chains are required for the correct rendering of a web page.
What are critical requests?
Critical request chains (network dependent requests) are required for the correct rendering of a web page: the loading performance of the web page is affected by the length of these chains, because the longer they are, the larger the download size.
Critical requests are flagged by SeoChecker:
How can I reduce the effect of critical request chains on performance?
First, by analysing the audit results, focus on the resources that most affect page loading:
- Make sure you reduce critical resources as much as possible, perhaps by eliminating them or postponing their download.
- Reduce download time by optimising the number of critical bytes.
- Download critical resources in advance.