Deferred Modification
Deferred specifies that geometry should not be modified until the user makes an explicit request. This method will improve performance, because the drawing will be updated only once — even if the values of several parametric dimensions have been modified.
Deferred is actually necessary when a set of parametric dimension modifications do not have valid intermediate geometry. For example, consider a triangle with sides of lengths 3, 4, and 5:
Figure 247. Triangle Requiring Deferred Modification
It would not be possible to change the side lengths to 30, 40, and 50 using Immediate, because no valid triangle can be created with a combination of old and new lengths.
 | Often a combination of Immediate and Deferred is useful when several parametric dimensions need modification. |