Key points explained in the diagram above:
Content delivery to website users:
Primarily for website performance, the WT.js tag and associated libraries are stored globally on Microsoft's Azure CDN.
Test content (javascript and CSS) are kept close to users, on our globally available OTS Delivery CDN.
Data capture:
This takes place local to where the user is, on their closest OTS server
Data is queued, and then shipped to the EU West region at which point the local data is discarded.
The Optimize application:
The User Interface is hosted in EU West
The analytics database is hosted in EU West
Queries between the two to report on your data take place, with it then being made available in our UI to wherever the Analyst is located.