Hi James,
Thank you for contacting Syncfusion support.
In TrackBarEx, “TimerInterval” property is used to set interval while increasing or decreasing the value using Increase/Decrease button. By default, value of the TimerInterval property has been 100. If the value of TimerInterval is high, then interval between value changing has been slow. We will modify our documentation with these details and it will gets updated before the end of this week.
Regards,
Keerthana J