The system requirements specs indicate a 2GHz CPU, and this really is a realistic baseline.
Running room-correction and other filters takes quite a lot of processing power: on a 2GHz system, the CPU will typically run at about 20% usage when music is playing. This figure will be slightly higher for non-Windows systems.
If you have more than one Squeezebox or Transporter (not synchronized), the music signal is processed for each one separately. If processing for each one uses a fifth of the computer’s processing power, then obviously this sets an upper limit on the number of squeezeboxes which can be supported simultaneously.
If your PC is used heavily for other things, then you may find that InguzDSP has a noticeable impact on the PC performance. Your mileage may vary, of course, but don’t try running on a 1GHz P3; it just won’t work.
