BTACTSML or BTACTTRL requests report Other DB2 Time. Other DB2 time shows the average thread elapsed time in DB2 that is not included in TCB time or in any of the suspension categories. The most common contributors to other DB2 time are MVS paging and Processor wait time "Other DB2" time is often a though one to debug. It is basically any left over time that is not attributable to any other CPU or suspend time that DB2 accounts for. The only two things you can try with CA-Insight is to start either an SQLTRACE or a hierarchical probe to trace the applications in detail. The other thing is to use the option22.214.171.124 from the main Menu(Address Space Tasks) to see if you notice the TCBs in any particular wait state.
STROBE can be used to determine what is causing the task delays.