There are some points which we need to think since data model also plays important part for Report generation since each time it hits qvw insame way file fetching data it hits database
1. try to keep data model clean with require fields and granularity
2. remove all unwanted objects from qvw
3. take only require fields in NPrinting
4. if you are using cycling then instead of using more than 1 fields if required try to make single key field on which it will loop, same applies for filters whether it is recipient level or report level
If you have huge data then NPrinting will take time for reading same
