MarketPress Memory and CPU Usage Problem

Hi, We started having major memory usage and CPU usage problems. We've upped the resources as much as possible on our shared server hosting. The site was crashing with a 503 error. After troubleshooting all plug-ins, we've found that marketpress is the culprit. Whenever we activate it, it causes a spike in resources and the site crashes. I hope someone can help. We've granted site access. The plug-in is currently off, due to the resource problems it creates. Thank you.