MDM connection - multi thread operation

[Former Member]

In our landscape we use portal interface for data entry to MDM. We could as much as 40 concurrent users. Portal system is connected
to MDM by  service id. For each user, there is a separate connection opened (although they use same service id). My assumption is for each connection a separate thread is opened to complete the requested operation.

Is my assumption correct? Is there any limit on number of threads that can be created?

[Former Member]

Also would like to know,

1) if we have optimized MDM data model and have 4 cores CPU how long it generally takes do a standard update operation and read operation in MDM.