Nice article....
I always took the page speed/load as how fast everything together worked, the server, web server, code, the overall connection speed to the site. If the site is slow, the bot isn't going to be able to connect as much as it wants or needs based on the incoming links and size of the site.
So if you want a facebook, besides creating something popular, you need the infrastructure in place to be able to handle your own growth and googles bots pounding your ass too if you want love from them.
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