In Creo Elements/Direct Modeling, you can update views in either classic update or graphical update mode. In classic update mode, you can instruct Creo Elements/Direct Annotation to update views with or without EconoFast support.
• In classic update mode: Creo Elements/Direct Annotation calculates the visibility of all model elements before calculating the view geometry.
With the EconoFast setting: Creo Elements/Direct Annotation first interprets the graphical data of views to determine the visibility of model elements, and then uses the results to more quickly determine hidden geometry.
If the screen flashes during the update, then the EconoFast window must not be covered by other windows. Otherwise, the result will be incomplete.
The EconoFast setting uses the same technology as the occlusion culling switch in the viewport settings. However, these features are only available for systems with OpenGL-based graphics cards. See the list of currently supported cards on the
Creo Elements/Direct website
Creo Elements/Direct Modeling detects whether an appropriate graphics card is installed, and if one is found, you can select the EconoFast setting. If an appropriate graphics card is not found, this option remains inactive. To select EconoFast setting,
1. Click Annotation and then, in the Setup group, click the arrow next to Properties.
2. Click View and select a view in the viewport or the Drawing Browser. The View Properties dialog box opens.
3. Click Calc Mode and select the EconoFast setting.
EconoFast can be a quicker method of updating your drawings since unseen view geometry is not calculated. It redraws the viewport and captures graphical information about which geometry elements are visible and which are not. This data is then used in the update process to determine the geometry that should be calculated.
A potential disadvantage in using EconoFast is that geometry elements smaller than one pixel will not be drawn. Therefore, a slight difference between the results of the two update modes may occur.
You can also use the EconoFast setting in conjunction with the Remote Update Server Module. When you use a remote server with EconoFast, the viewport redraw is done on the client and the update calculations are done on the server.
In general, EconoFast is useful during the design stage and for updating views before making a printout. In this way it can be regarded as a draft update mode. However, it is advisable to use the normal update mode when finishing a drawing.
You can determine what mode has been used to update a view by looking at its entry in the Drawing Browser. Views updated in EconoFast or graphics modes show the appropriate icon next to the view icon. Views updated normally do not display either icon.
Properties.
or graphics 
modes show the appropriate icon next to the view icon. Views updated normally do not display either icon.