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Read Managing resource order and request size/count to improve page speed and crawlability 
Improve page speed and crawlability
There is an extremely narrow relationship between page resource order and the load time...
Read How does a browser create a web page? 
How does a browser create a web page?
As a technical SEO, it is important to understand how a browser creates a...
Read What web developers need to know about technical SEO 
What web developers need to know about technical SEO
If you’re doing technical SEO but not running the website you’re responsible for, the...