To be fair, Photon has done most of the grunt work. Offloading all the static content to a content distribution network has been the biggest factor in our ability to scale.
We're still limited by the size of our internet connection, but now we're just using it for HTML instead of HTML, CSS, Javascript, and tons of images.
Tweaking the # of server processes really just limits how many people can actively connect to the server at any given time. It is a form of throttling which ensures that there is a enough CPU to go around...
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