Lots of factors can give rise to slow execution of a transaction or a report. Sometimes there are general system problems. Sometimes users use the program in a way it was not designed for. Sometimes the nature of the application and workload calls for parallel processing. And sometimes the source of the performance issue can be traced back to your ABAP code, mainly the construction of your OPEN SQL.
While there are many reasons other than database performance that could be causing the performance problem, this blog series will focus on just this aspect. If you’ve ruled out deficiencies in the system setup, mishandling by users, or the need for parallel processing, then you need to revisit your code and see if the source of your performance problem is hiding there.