CSV to XML for Huge File

Hello Experts,

I have a scenario where in I have to use a sender SFTP adapter and convert 25 MB CSV file to XML and map it to IDOC.

I have used message transform Bean to do the conversion,but the load on the PI system too much.Is there an alternate approach for this

1 more approach is that ,I can read the entire row into one field and then use java mapping to extract the fields based on comma separator.

Even then the load is too high.

Please suggest any alternate approach

Regards

Advit Ramesh