Urgent HELP - How to reduce the number of entries in table MESYBODY?

Does anyone know how to reduce the number of records in synchronization table MESYBODY and MESYHEAD? The reason I wanted to reduce these tables is because I believe they have so many duplicated entries that causes extremely slow performance everytime we sync. Currently, there are almost 50,000 records for approximately 100 users, and I believe it shouldn't be that much.

We are running into a problem that it takes approximately 25-30 minutes to sync.

Any advices would be highly appreciated.

Regards,

Dai