fact table loading

Hello friends ,

I do have a source Fact Table F1, which is loading into the destination Fact table F2.  Table structure in both places are same

Data count in the F1 is approx 20 million which is being loaded into the destination.

Table F1 do not have any Indexes,no Primary Key ,no identity  ,just a simple Table and same is of Destination F2.

In the DFT , From the source  i selected the table and in the OLEDB destination i selected the table .

Issue : The data loading is taking 20+ mints into the destination table

Any way to Optimize Fact table or do the fast loading . The same way i do have 4 more tables and approx same  number of records .

let know any more details required

Please suggest .