Import large number of data using CSV/XLS

I have a import functionality in that I upload CSV/XLS file to import a data. I have a 30000 records (CSV) file.(size : 3.4 MB).

This file will take 40 to 50 MIN. to import a data.

As per each record I stored data into 3 tables.

I want to reduce that time to importing a data. What should I do please help me

Thanks In Advance