If you have the Partitioning option, you can enable the Data Integration Service process to maximize parallelism when it runs mappings in the native environment. The Data Integration Service process must run on a node that has multiple CPUs. When you maximize parallelism, the Data Integration Service dynamically divides the underlying data into partitions and processes all of the partitions concurrently. When the Data Integration Service adds partitions, it increases the number of processing threads, which can increase mapping performance.