For the sunlight simulation effect, I used the SunFlow rendering engine (quality 3 or 4) which is necessarily longer because it takes into account the lighting.

For a "classic" animation (moving the visitor) and without lighting, 3D offscreen images (quality 1 or 2) are much faster.

To return to your original question, it is possible to change the frame rate in a plug-in or a derived version of SH3D if it is different from the standard video panel .