Hi guys, the speed limiter setting is specifically designed to only touch parts of the script that are too fast/dangerous, so we can keep the script creators intent as much as possible. So during slower sections you shouldn't see any changes and still experience full depth strokes.
A lower percentage may not have any effect, either because the script does not contain any strokes that are fast enough to trigger the speed limiter, or because the toy is too slow to play them at full speed, and was therefore limiting the maximum speed already.
I just tested it with Handy Pro 2 on DeoVR to confirm that it works. If your toy is slower (Keon) or not overclocked (Handy 2 Pro) then the difference may be more subtle. Try switching the speed limiter between 0 and 100% during a fast section to notice the difference.
For people who are familiar with scripting, here are some sample graphs.
Original script:

Cadence smoothing at 100%:

Speed limiter at 50%:

You will get the smoothest results by combining cadence smoothing (100%) with the speed limiter (50%):
