Performance issue while fetching 20000000 records

I have some 20000000 rows in my database. While fetching records on some criteria it take too much time. I created all possible indexing also but still it took more than 3 min. How can i improve performance of my Sp. In Sp I am using Temp table also and lot of join between those temp table. Will it improve performance if i create views by joining few tables and then fetch data from those views.RegardsPriti