Compressed-air feed system for operating a pneumatic system, in particular an air suspension system of a vehicle, having: - a compressed-air supply, - a compressed-air connection to the pneumatic system, - at least one ventilation connection to the surroundings, - a pneumatic main line between the compressed-air supply and the compressed-air connection, which pneumatic main line has an air dryer and a regeneration throttle, - a ventilation line between the pneumatic main line and a ventilation connection, which ventilation line has a ventilation valve and a ventilation throttle, - a bypass line between the compressed-air connection and the air dryer, which bypass line has an additional bypass valve which is formed as a 2/2 directional valve and which permits an air flow conducted via the air dryer, and bypassing the regeneration throttle, for filling and ventilating the pneumatic system, which furthermore has a compressed-air reservoir, in particular additionally or alternatively as part of a pneumatic system which is connected via a filling valve to the pneumatic main line and which is designed to, in the presence of a boost mode of the compressed-air feed system, fill the pneumatic system with compressed air via the filling valve and the pneumatic main line, and which is designed to provide a first filling operating mode (311, 312) in which the bypass valve and the filling valve are at least temporarily simultaneously open, such that the pneumatic system can, over a predetermined time period of a filling process, be filled by means of an air flow from the compressed-air reservoir, which flow is, in part, limited not by the regeneration throttle but by a minimum flow cross section of the bypass line. - a compressed-air supply, - a compressed-air connection to the pneumatic system, - at least one ventilation connection to the surroundings, - a pneumatic main line between the compressed-air supply and the compressed-air connection, which pneumatic main line has an air dryer and a regeneration throttle, - a ventilation line between the pneumatic main line and a ventilation connection, which ventilation line has a ventilation valve and a ventilation throttle, - a bypass line between the compressed-air connection and the air dryer, which bypass line has an additional bypass valve which is formed as a 2/2 directional valve and which permits an air flow conducted via the air dryer, and bypassing the regeneration throttle, for filling and ventilating the pneumatic system, which furthermore has a compressed-air reservoir, in particular additionally or alternatively as part of a pneumatic system which is connected via a filling valve to the pneumatic main line and which is designed to, in the presence of a boost mode of the compressed-air feed system, fill the pneumatic system with compressed air via the filling valve and the pneumatic main line, and which is designed to provide a first filling operating mode (311, 312) in which the bypass valve and the filling valve are at least temporarily simultaneously open, such that the pneumatic system can, over a predetermined time period of a filling process, be filled by means of an air flow from the compressed-air reservoir, which flow is, in part, limited not by the regeneration throttle but by a minimum flow cross section of the bypass line.