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I was wondering what the maximum number of users is for xoops, concurrent user capacity and it's level of scalabilaty.
Are any limitations simply CPU / RAM / Bandwidth or is there some other inhibitors that would limit concurrent or maximum users.
There are now limits set, except by your CPU/RAM/Data transfer.
Xoops it's self has sites with thousands and thousands of users, with no known problems as yet. You may wish to search the XOOPS forums for biggiest user bases, as a simlar question has been asked before many times.
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Do the number modules you attach affect performance.
Of course it can, the more information you pull from the DB and your users download (This includes images and other data), in theory the slower it can go, again depending on the server you run, I currently have around 30 mondules running on one site and nearly as many on others, with no problems and around 5 sites on the same server again with no problems and with thousands of users. One DB is now over 350MB
I can answer your other questions, thats maybe one for a developer of Xoops.