|speed||the number of times per second that the physics system updates|
GameMaker: Studio updates things based on the room speed,
so that if you set it to ,say, 30, GameMaker: Studio will
run 30 steps in the course of a second. However, for the physics
functions that may not be enough and you may want things to be
updated at a slightly faster speed to increase stability or
precision. To that end we use the function
physics_world_update_speed which sets the update speed for
the physics system independently of the room speed. This
means that you could have a room speed of 30, but set the physics
to 60, effectively doubling the speed at which the physics system
updates and performs its calculations compared to the speed at
which the step are updated.
Note: you cannot currently set this to any less than room speed, but future updates may change this.
physics_world_update_speed(room_speed * 2);
The code above sets the physics system update speed to be twice that of the room speed.