Hi Imran,
We are facing similar issue, upgrading our ERP EHP5 (SPS10, NW702) to EHP7 (SPS03, NW741) using SUM 1.0 SP10 Patch 2. The ACT_TRANS phase took 19 hours. But the worst yet is the PARMVNT_TRANS phase which after 2 days only processed 94449 entries and still has 370967 in the DDXTT table to go. I too just logged a message and wondering if you ever got a resolution from SAP?
Elaine Wolf