You can find it under “Options” → “Preferences”
My 545 unit/s threshold was calculated based on formulas provided in the following topic:
https://discuss.eroscripts.com/t/some-guides-and-formulas-you-can-use-when-scripting-for-the-handy-using-ofs/35396
If the video really demands a stroke speed beyond the device’s limitation, try to play around by lowering stroke length.
You can also be creative and incorporate patterns, such as waves.
