問題文
A page load waterfall shows long BLOCKED segments on several objects that all come from one domain, while DNS and CONNECT are short. What does the documentation say BLOCKED time represents?
選択肢
- The stretch in which the browser waits for a script to finish, because a parser holds the remaining objects up to a maximum until that script returns.
- The stretch in which the browser waits for the name of the domain to resolve, because the browser process does not keep a cache of records at startup by default.
- The stretch in which the browser waits for the server to release its own connection limit, because a server advertises the maximum number of streams it will accept per client.
- The stretch in which the browser waits for an already established connection to come free, because a browser allows a maximum number of concurrent connections per domain.