uses a multithreading approach to data import to process multiple Setups simultaneously and reduce import times. However, users can optimize multithreading to accommodate their machine’s processing ability.
This is controlled from the Settings | General dialog.
The options sets the number of threads used during import:
Safe Mode- One thread (the safest choice)
Balanced- Uses a balanced amount of threads
Fast- Use the most threads (can cause instability during import depending on system resources)