In most cases it is best to start by reducing the amount of data in the view.
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Use the Point Cloud Clip tools to restrict the display to the relevant area.
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Use the Point Cloud Presentation group settings to display only the classifications of interest.
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Adjust the point density and point size
Tip: Tip: the key-ins POINTCLOUD DENSITY and POINTCLOUD WEIGHT can be used to set density and weight to all point clouds inside the dgn. These key-ins can be mapped to function keys or referred to in custom tool bars.