Load PSA & data targets in parallel and dialog processes

We have noticed that when we load data into BW using the processing option: PSA and Data targets in Parallel, that the system basically uses all available dialogue processes on the application server that it 
is running on.  On systems where we only have one application server, this obviously renders the server useless for anything else. In addition we have seen that even when we have additional application servers, the system is still virtually useless and extremely slow.  We would like to be able to use this option for large data loads, as it theoretically can allow these large loads to complete in a shorter amount of time.     
However, this issues we see cause us to be hesitant to use it, as we cannot afford the system to be affected so negatively while they are running. (we are bascially a 24x7 shop for users).                      
Is this the behavior that is expected?                                  
Is there some way that we can limit the number of processes this mode   
consumes?
Are we missing something?

It is a basis setting, but you can limit the amount of processes one user is using in parallel.
As I'm not basis, I don't know the setting, but we were able to pull it off at my current client.
kr,
Tom

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