Running test.pl from DBD::CSV and then from DBD::RAM (edited).

Testing empty loop speed ...
CSV 100000 iterations in 0.2 cpu+sys seconds (476190 per sec)
RAM 100000 iterations in 0.2 cpu+sys seconds (416666 per sec)

Testing connect/disconnect speed ...
CSV 2000 connections in 1.6 cpu+sys seconds (1265 per sec)
RAM 2000 connections in 1.3 cpu+sys seconds (1503 per sec)

Testing CREATE/DROP TABLE speed ...
CSV 500 files in 1.8 cpu+sys seconds (273 per sec)
RAM 500 files in 1.0 cpu+sys seconds (480 per sec)

Testing INSERT speed ...
CSV 500 rows in 1.1 cpu+sys seconds (450 per sec)
RAM 500 rows in 0.6 cpu+sys seconds (793 per sec)

Testing SELECT speed ...
CSV 100 single rows in 8.7 cpu+sys seconds (11.5 per sec)
RAM 100 single rows in 6.7 cpu+sys seconds (14.9 per sec)

Testing SELECT speed (multiple rows) ...
CSV 100 times 100 rows in 10.7 cpu+sys seconds (9.4 per sec)
RAM 100 times 100 rows in 8.8 cpu+sys seconds (11.3 per sec)