The more effective energy output and the greatly reduced size of a cold fusion reactor has allowed humanity to increase the effectiveness of the Micro Impulse Drive. The effective speed of a vessel the size of a colony ship has been doubled. Small ships have also received a speed boost, but not as great as a colony ship. The 'fold' in space, which depends on the mass of the ship along with nearby mass concentration, is doubled for a colony ship. The main problem with this form of propulsion is still the small steps of the Micro Impulse Drive that are made to accomplish ship movement.