Parts that contain numerous rounds, chamfers, holes and especially smart patterns will process more slowly than a part from which these features have been removed. Good modelling practice generally suggest that rounds should be placed towards the end of a design as these will commonly slow down the display performance of a part as it adds more complex surface to generate and display. Other features, such as threads (which have a number of complex surfaces to generate) and complex/multiple patterns will also cause model display to slow down.
In order to improve display performance in these type of instances, you could consider suppressing these features (if they are not integral to the part of the design you are currently working on) so that display performance is improved.
Other things that can affect the display is part styling used. Floor reflection, drop shadows, textures and reflections (see View overrides on the view tab in the Style section) should be turned off while in everyday work mode.
One other thing that can improve performance is to change the arc smoothness (sharpen command). Using a faster display will cause the circles to display less smoothly, but quicker. The downside of this is that edges in silhouette may not always display in exactly the correct place.
When working with an assembly, it can be useful to work with a simplified version of a complex part, ie parts of the model can be suppressed/hidden. The simplified version of a model can be toggled on and off easily from the assembly pathfinder.
The commands in the Simplify Model environment allow you to reduce the complexity of a part so that it processes more quickly when used in an assembly. The ultimate goal of part simplification is to reduce the total number of surfaces that make up the part.
You access the commands for simplifying a part using the Simplify Model command on the Tools Tab in the Part and Sheet Metal environments.
The Modify toolbar contains commands that allow you to specify which features and faces you do not want to display in the simplified version of the model. You can delete faces, regions, holes, and rounds from a part. After you have simplified a part, you can return to the Part or Sheet Metal environment with the Design Model command on the Tools Tab.
You can also simplify a part by adding extruded and revolved protrusions, and extruded and revolved cutouts. Feature construction commands are included in the Simplify Model environment because sometimes it can be easier to simplify a part by adding one new feature than deleting many features. For example, you can construct one protrusion that obstructs several features, which then eliminates dozens of surfaces in one operation.
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