…would WordPress be able to render the website in less than one
second…
WordPress is perfectly scalable to the amount of content and user base you’re describing.
You just need the horsepower for httpd (apache/nginx) to be able show one second page loads and have the database server (mysql, maria) respond fast, too.
You also need to configure the server – using various httpd and mysql utilities – to handle the loads, as well as work with php configs and opcode caching.
There is already all kinds of information out there on high performance WP sites and scalability: http://www.google.com/search?q=is+wordpress+scalable
There are too many options to cover here; many will depend on the server, the host, and on and on. https://serverfault.com/ is much better for server questions, as much of the time, they won’t be WordPress-specific.
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