FIM Reporting initial sync running long time

We have installed FIM Reporting last month , afterwards our FIM reporting initial sync powershell script is running from last month to Sync FIM data with SCSM server , but still only half data is synced with SCSM server ,

we have 4 server

1. Server1 --FIM server

2. Server2 -- FIM database

2. Server3 -- SCSM service manager  and SQL server Databases for Service manager and Data warehouse

4. Server4 -- Data warehouse server

As FIM initial sync script is taking long time to sync so we found some errors in Server 4 (Data warehouse server) multiple times during ETL jobs running.

Error screen shot

Please give some suggestions to make FIM initial sync faster