You will find a document at the end to read about you can read it from the link.
LET'S GO
A thread 🧵 on website speed, with Google teams explain.
G - A site might be fast for one user but slow for another user.
Me - if the user face any internet issue your website must serve it's parpose as fast as possible.
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G - Two sites may finish loading in the exact same amount of time, yet one may seem to load faster (if it loads content progressively rather than waiting until the end to display anything).
Me - Don't let the user wait for everything to load, show Important content 1st.
2/3