Most servers are currently configured to HTTP/1.1, which has been used for the last 20 years or so. HTTP/1.1 only allows you to make single server requests, one at a time, meaning that the client has to make multiple requests for resources in order to successfully render the page, which can take a lot of time if there are a lot of resources.
Optimising Your Website for HTTP/2 Crawling and SEO
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