During initial data load into a base object, you can parallelize the batch job to improve performance.
Configure the following parameter in C_REPOS_TABLE to improve the performance of initial data load:
PARALLEL_BATCH_JOB_THRESHOLD
Parallelizes the batch job. Set the value to a number that is less than the number of available CPU cores that the MDM Hub can use. For example, if a machine has 4 CPUs, but only 2 are available for the MDM Hub to use, and each CPU has 8 processor cores, then the maximum value that you can set is 15. Default is 1,000.