'-Qf' - FASTER COMPRESSION [REGISTERED VERSION ONLY] The '-Qf' option causes LZX to increase the speed of compression, without affecting the degree of compression. Of course, this option has a price; it also causes LZX to use 32K more RAM. The '-Qf' option doesn't improve compression speed for all files; text files, for example, generally see little improvement in speed, while Amiga executables compress about 5% faster.