Currently, the system does not support the creation and registration of 100k serial number in a reasonable time. Workarounds are required for the management of the process in order to improve performance and avoid redundant call to certain query.

This scenario is reproducible in both AX2012 R3 version and D365.
For AX2012 R3 version a ticket was logged 120012921001171 and the Support Engineer Team already provided some suggestion to improve the performance and speed up the process.
We suggested that the same improvements will be included in D365 version so that we can guarantee continuity of the processes to existing customers.