I'm not familiar with DolphinDOS and just looked at the description. We use almost all of the C64's memory for code and data. Perhaps the expansion also requires some RAM, and that might be causing a collision. But even without a fast loader, Evil Spirit's loading times should be very reasonable. However, I'll keep it in mind and perhaps include it as a possible technical issue in our manuals in the future. Thanks for sharing the problem and the solution!