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 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 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 . <EOS>