@ctrl_shift_esc
Vice emulates the C64 and some other Commodore 8 Bit Computers. If you start x64.dge, you get the C64 Emulation, xvic.dge starts the VIC-20 Emulation and so on.
You can't overclock the Emulator from the menus anymore, at least as far as I have seen, but setting the clockrate to 400 or 430 MHz in dmenu before starting works fine and everything I tried runs in fullspeed, except while emulating the loading from a Floppy disc, but this is to be expected, cause the original Commodore Floppy drive had an extra CPU, that must be emulated too.