Can one just extrapolate things?
If you keep on increasing CPU power any memory size, won't you hit the data i/o speed of the permanent storage (harddisk or NFS or SAN or whatever)?
If you get that boosted, won't you hit the speed of the network interface, current level 1 GBit/s. If your server is utilized by 5% of the users, that gives 1000 MBit/s : 5000 users = 200 kBit/s per user.
Hardware and performance
Reqrired frontend and backend specification required for about 100,000 user
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