SSIS Package taking hours to complete

Good Morning All,

We have an SSIS package and its taking hours to complete. There is on data flow task which is just a query based off 4 tables and it takes long time to render results. One table in particular is taking forever when all i did was count

select count(*)

from latetable.

I looked up and it has indices , can someone please tell me where to start looking?

Thanks