Represents a game speed option at which the map can run. There're five predefined settings, but only SLOWEST, SLOW, NORMAL can be set and used. Setting FAST or FASTEST will automatically set it to NORMAL instead (v1.32.10)

Warcraft 3 game speed setting:

Menu Name	Game constant	Speed	10 seconds is:
High (default)	MAP_SPEED_NORMAL	1.0x	10s
Medium	MAP_SPEED_SLOW	0.8x	12.5s
Slow	MAP_SPEED_SLOWEST	0.6x	~16.667s