Maximum Fields and User on CB

My direct questions are:

1. What are the maximum number of fields on CB?

2. What are the maximum number of users on CB?

Technically, the information above is stored on jos_comprofiler, so is limited by table colums or rows? Or issit limited by the table size?

1. What are the maximum number of fields on CB?

Column size limits. There is no hard limit to the number of fields. The _comprofiler table column size fills up according to SQL limits and then will error out, but there's workarounds like changing fields column type to text instead of varchar, which stores information separately and isn't subject to column size limit.

2. What are the maximum number of users on CB?

There is no limit. Whatever your database and site can handle. Of course the more you have performance will gradually decline, but you shouldn't hit any sort of issues until you reach 300,000+ at which point you'll want to be setting up decent servers to maintain the larger userbase.