Still, in this case this shouldn't be a problem. A file causing the error has 599 MB (the error says TIC memory limit exceeded 799 MB). I can load slightly smaller file which has 572 MB. During the backtest Zorro uses only 781 MB of memory, so there's still lot of potential space.

A side note: Zorro is almost 5 years old. As I see it the market generated data volume has almost doubled since that time. It will probably grow in the future too. Something has to be done to keep up with this development.