Android : Application Become Too Slow When I Use Sqlite

I am developing one application.In this i am using the sqlite database.In this first time I am taking the data from assets and then insert this data into database.and secondtime onwards i am taking data from Database.But first time also my application is very slow.Finally my application is too slow.My question is ,is generally application become slow when we use the sqlite in our app?and what we can do for this type of issue.Please give me some suggestions.Its very urgent.