When you navigate inside of the text editor, HippoEDIT tries to use by default smooth scroll behavior for better usability.

The logic is smart enough and only use smooth scroll in not repetitive navigation actions (if you hold page down for a while you will notice that smooth scroll is disabled) and if this makes sense ( a portion of text to scroll is rather big).

If you do not like smooth scroll by esthetic or performance reasons you can disable it using XML flag in file settings.xml:

<Source_Edit>
    <SmoothScroll>false</SmoothScroll>
</Source_Edit>

#xml_option #performance