LinPlug Octopus - Manual (Page 49)

Optimizing CPU Usage
Software synthesizers are highly CPU-intensive. The real-time calculation of
audio waveforms, filters, effects and modulators places a significant load on
the host computer's CPU.
As such, the main limiting factor in software synthesizer performance is
CPU processing power. Each additional oscillator, filter, effect and
modulator that is included in an instrument adds to the CPU load. As a
result, it's best to switch off any unused units within the Octopus to
conserve CPU resources.
It may also be useful to use the send effects of your host’s mixer instead of
Octopus's effects as they are shared among all instruments.
Manual 47