Having worked on the f100, the embraer, and the 2,3,4,7,800 series 737s, the embraer is much quicker to load and unload than any of them...
The F100 only has one entry/exit door, and also has 3 seats on one side which slows things down. The 737 variants have 3 seats each side, which slows things down a fair bit, but with 2 entry exit doors.
The embraer with 2 entry/exit doors and 2 seats aside make it very quick to unload, clean, and load. Provided theres no training happening up front, and you get some efficient ground and cabin crew, its possible to turn them around in 15mins without rushing. Once the doors are open, its about 1-2minutes on a full business flight.