When you use Piapro Studio, set the sampling rate of your audio devices in any of 44.1kHz, 48kHz, 96kHz.

Comparing to the system load of other general software sound, the one of Piapro Studio VSTi is heavier because Piapro Studio synthesize the voices,
we recommend that you set the buffer size larger. As to the optimum size, it depends on spec of your computer, host application(DAW application) and plug-ins that you use together.