When TR is taking much time to PROD system SAP

1. Issue with Network, may be the QAS is defined here as Domain Controller means /usr/sap/trans directory is available in the local system. so that 
2. the time it takes to transport in QAS is very less and whereas in PRD it has to travel through the entire network thus consuming more time.
3. Check for STMS Consistency, SE38->Execute RSTPTEST report
4. User load is sometimes more in PRD system as QAS has less number of users working