AFAIK the speed of travel to the switch is set by cura, the switching speed itself and the short distance move into the bay are set in the /user/share/griffin/griffin/machines/um3.json file as hotend_switching_speed and default_travel_speed respectively.
Feel free to try some different values, but be aware that faster operation may cause more errors (which can be seen as leveling errors, or just mess up a print) and possibly damages things, especially if not calibrated perfectly.
Unfortunately this is not a setting that can be change within UltiMaker Cura.
It is controlled firmware side.
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