Hello,
Currently the number of queries running in parallel during an EC build is set at the server level. With setting "Build / Base Table Max Threads" (4 by default).
The optimised number of simultaneous queries is very much dependant on the context of the EC. For instance, an EC with 4 differents date source is more likely to accept a high number of simultaneous queries (spread over the 4 data sources), than an EC with only one data source.
Therefore, I would like to suggest to make this setting per cube instead of at the server level. An alternative would be to have this setting at the Data Group level.
Thank you and best regards,
Franck