What are the four suggestions for website optimization?

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Google released a web page statistics report based on the 4.2 billion pages they indexed (sites with high PageRank may have a higher weight):

* the average capacity of a web page is 320KB (including scripts, pictures, and CSS embedded in the page), but it should be noted that some websites use robots.txt to prevent Google crawlers from obtaining CSS and JS script files

* only 2max 3's compressible content is really compressed. It should also be noted that some websites provide compressed content for real browsers, while those for Google crawlers are uncompressed.

* 80% of the pages contain 10 or more material from the same host

* most popular websites do not write all the scripts and CSS stored on the same host together, resulting in an extra 8 HTTP requests

* the number of images contained in each page is 29.39, which adds up to 205.99KB

* each page contains 7.09 external scripts and 3.22 external CSS. The average script size is 57.98KB. CSS is 18.72KB.

* only 17 million web pages use SSL encryption, accounting for 0.4% of the total

* the average web page loading speed is 4.9 seconds, requiring requests from 49 different sources

Google's move is to increase people's attention to the optimization of web page reading speed, and they provide a lot of help guides for web developers to improve efficiency. There are four main suggestions given by Google:

Use Gzip to compress pages

Use HTTP caching

Optimize JavaScript code

Merge scripts and CSS

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