We can find many size guidance in readme, installation guide or deployment guide (https://docs.aveva.com/bundle/system-platform-deployment-guide/page/385693.html) but I can't find anything about sizing an OMI web server for 10/100/500/1000 users.
I know that a part is executed by the client but I assume there is also a part executed by the server. It has been presented as a solution with high scalability but it's not enough details for our real current situations.