A Delay of 0 and Interval of 1 make this a fast slider.

   
     

<Window x:Class="ClassicControls.SliderTest"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="SliderTest" Height="252" Width="482"
     >
  <StackPanel>
    <TextBlock Margin="10" TextWrapping="Wrap">
      
    </TextBlock>
    
    <Slider Margin="10" TickFrequency="1" TickPlacement="TopLeft" 
            Maximum="10" Delay="0" Interval="1"
          >
    </Slider>
   
    </StackPanel>
    
  
</Window>