Hi @illitirit - thanks for checking in! Are you talking about network speed, build speed, or load speed? All these can depend on a variety of factors. 
Our build network is shared, so building is always variable and dependent on who else is building a site at the same time. This post contains some useful info on that:
As far as paying for the broadest possible network - our enterprise CDN has more nodes than our CDN see this and this thread for more information on that.
If you need to compare our services, here is a great place to start!
Good luck!