Hi,
as you said daily loading the 3 million records it is correct?
fallow the below steps.
1. check the job details in info package level?
2. how time taking time form source to PSA?
3. how much time taking the DSO activation time?
4. check the cube loading form source to target?
5.it is depends on the all process.
check the one by one.
what time you schedule the time for Process chain?
Thanks,
Phani.