Huhe Joiner node problem!

I've got a question regarding the Joiner node.

I created a workflow opening two CSV files. One CSV file has got 3 columns and 1270 rows, the other has got 6 columns and 0.5 million rows. I want to join them by one column (inner join). No matter what I do, the Joiner node takes like half a minute for the first 60% and maybe a year for the rest.

The systems processor has 8 cores (8 x 2.0 GHz) and 16 GBytes of memory. I tried all the tricks from the KNIME FAQ (changing the KNIME ini file), nothing changes.

Can you help me?