Containership speeds have peaked to an average of 20 to 25 knots and it is unlikely that speeds will increase due to energy consumption; many shipping lines are opting for slow steaming to cope with higher bunker fuel prices (when there are market spikes) and overcapacity. The deployment of a class of fast containerships has remained on the drawing boards because the speed advantages they would confer would not compensate for the much higher shipping costs. Supply chains have simply been synchronized with container shipping speeds.