The default speed is 1. A speed of 2 means twice slower. A speed of 0.5 means twice as fast.
The default duration between to consecutive frames is 1 tenth of a second.
See also STATE_3D_sequence_set_frame_duration()
Example:
Lets assume that the frame duration wasn't changed from it default (you can change it using STATE_3D_sequence_set_frame_duration() )
That means 1 tenth of a second between two frames.
So if the speed is equal to two then the duration between consecutive frames will be 2 tenth of a second
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