We study the performance of file servers, comparing NFS implementation in Linux to our experimental lightweight system called ORFA. The aim is to find out NFS bottlenecks in the case of high bandwidth local network. Using a simple protocol without cache allow us to get best performance from the underlying communication subsystem. Our user-level implementation avoids several kernel-level constraints and thus provides better performance than NFS. Moreover we explore several optimization techniques to reduce the server overhead which usually is the bottleneck.