Inconsistent sprint speed while in creative mode

While flying, doubletapping `w` doesn't affect your speed, but it is possible to retain sprinting speed from running on ground and starting the flight. This gives approximately double the speed of normal flight.

Moreover, a similar effect can occur when one submerges in water - if you're flying underwater (not swimming), doubletapping `w` causes your character to move much faster. The effect stops if one get off of the water.