It is possible to execute multiple source-to-destination transformations (extract-load) in parallel threads.
By default, the Etlworks Integrator limits the number of threads to 5 but you can change this limit.
Here are the steps to limit the maximum number of threads:
Step 1. Create a Flow with parallel transformations.
Step 2. Create a nested Flow and add a Flow you created in step 1.
Step 3. Set the parameter
Maximum Number of Parallel Threads to the positive integer > 1.