The basic consumption of the Flight Spell is not high, ranging from 1 to 10 magic points per second based on flight speed. However, this only applies to ordinary flight mode and in the absence of any obstacles in a straight flight path.
Competitive flying requires a professional Racing Broom. When the Racing Broom's high-speed mode is activated, its maximum flight speed and magic consumption doubles. In high-speed mode, high-difficulty manoeuvres, such as abrupt stops and turns when passing through obstacles, cause magic consumption to evaporate massively. Passing through each obstacle consumes nearly a hundred magic points!
Therefore, in competitive flying, the amount of magic stored is a critical factor for the competitors.