Ministry of Industry in the "broadband speed test method for a user's online experience," the first specification standard definition screen time is:
A first and a browser screen pages consumed by the standard dimensions of 800x600 pixels, loaded into the browser from the start page display 600 pixels and height of this region of the display time of the content.
That user can see the time in the area of finished loading all the elements.
A page of "total load time" than the "first screen time" long, but for the end-user experience, when the first screen area is full of content, the user can see the main content of the site and can conduct their own choice . The first screen time of fast and slow, direct impact on user awareness of the site.
In the domestic network conditions, typically a website, if the "first screen time" within two seconds is relatively good, the user can accept within five seconds, 10 seconds or more on the intolerable.
Refer to article link:
1. how to calculate the first screen time? https://www.cnblogs.com/caizhenbo/p/7993533.html
2. How to shorten the time to optimize the fold? https://blog.csdn.net/liuyingv8/article/details/82969577
in which this process should know:
browser after getting user requests, these experienced the following stages: pulling cache redirection → → → DNS queries establish → → TCP connection initiation request received in response to processing HTML elements → → loaded elements.