DBD-SQLite is just a speed devil. After noticing that my application's speed dropped 900% with DBD::CSV (and _huge_ ammounts of data), I switched to DBD-SQLite. No problem here. The speed is just amazing.
Great module for people who _do_ need a database, but who don't want to force their users to install packages like MySQL/PostgreSQL (which can be overkill).
The documentation could have been a little better -I always love a lot of examples-, but Google is -as always- your friend. I got a simple test script running in seconds.
I am more than pleased with this module and recommend it to everyone.