Hi Daniel
Please provide some initial information :
a) Is this a new Batch job ? Or was it running fine earlier and suddenly started running slowly ?
b) Are other jobs / processes in your system running fine. In SM66 , are you able to see any long running processes.
c) What is your DB and OS version
For the background job which is slow , if you select the job click on the Job Details in SM37 ---> you will see the process ID of the job.
Using that process ID , you can search in SM66 ---> this will show you what exactly the process is doing .
Based on this - investigation can proceed.
Thanks
Rishi