The nifty C64 cartridge designed by Scott Nelson of Epyx that can "load, save and copy your disks five times faster than normal." It also allows you to send disk commands (e.g. list directories, etc.) without erasing programs stored in memory.

Epyx knows what people want (unlike some companies).

Unfortunately, there's a rumour that the Fast Load Cartridge eventually ruins your 64 computer. See Game Genie.