A large webapp with several simultaneous accesses

General
1

I would like to know more details about the xojo webapp support…
The system supports about 4 or 5k in simultaneous access ?
The app will be VERY large with several accesses to the database and etc.
What is the best host for this ?
Xojo cloud ?
The xojo cloud support x64 and more than 4gb of ram ?

2

For that many users you will need to load balance several standalone instances. I typically put 10-15 users per instance. So you will have at minimum 400 processes for 4000 simultaneous users. You are definitely in multiple dedicated servers territory for that.

Remember with a system with 100 users only a few will access it at the same time during the week. SO if you need 4000 simultaneous users then I’d expect you have at least 40000 total users and you need to accommodate 10% of them accessing the app at any given moment.