The "Slow Local Anchor Jumps" menu option sets a 
flag which is used by the OnHandleLocalAnchorJump 
method of the HTDisplayBox component. This method 
is used to modify how clicks on links to local 
anchors within the same file are processed. In 
this case, the scrolling of the display is 
deliberately slowed down by making a series of 
calls to the Position property of the HTDisplayBox 
component. (This could be used to interpose 
control behaviors prior to local scrolling, such 
as to a large bitmap.)

(Note: Assert methods normally are used to abort
all further processing of an action, while the
Handle Methods modify the processing. These
two methods can each be overridden in code by
direct assignment for Assert types and virtual
overriding for Handle types.)
