Dozens of vendors offer global Content Delivery Networks (CDN) today. I always worked with Akamai in the past and was very satisfied with their performance.
Basically, a global cacheing vendor proxies their global infrastructure in front of your web site and HTTP requests from your site are intercepted and delivered remotely on a local basis from your CDN vendor's server instead of from your remote central location. That shorter distance saves the transit time for the end user.
These cacheing networks are very important for remote users inside of the China firewall. Hosting your cached content inside this wall can cut your delivery time to a remote user by as much as 10 seconds or more per page. These effects are less for well connected countries like the US, Japan, and Germany but bottlenecks do still occur. Global network performance "weather maps" track latency times and adjust network delivery to minimize transport times.
This is another reason to minimize the number and size of HTTP requests required to build your pages. The fewer requests mean less connections are required to deliver your page.
This Web site is aimed at capturing some of the basic concepts I use when creating integrated marketing programs and leveraging the internet.
Phil Gibson ©2016