SSIS Performance

Hi,

I have a task in which we are loading a fact table with millions of records. It includes many more unions and joins. The joins and unions are in the same database. Right now we are using Execute SQL Task to do this job. Its taking around 8-9hrs of time to load this fact table.

I just want to know, if I replace these joins and unions with SSIS DFT controls like Merge Join, Unions instead of doing it in the SQL Query, whether this will increase the performance of the load.

Please let me know if anyone is having idea on this. We need to optimize this task at any cost.

Please suggest if you know.

Thanks in advance...