creo8 config.pro option documentation for: ENABLE_HLR_HASHING 
enable_hlr_hashing
Enables hidden line removal hashing.
Default and Available Settings:
yes
- Enables and enhances the speed of hidden line removal process when you work with parts with large number of small edges.
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| This setting may increase memory consumption.
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no
* - Disables hidden line removal hashing.
It is recommended that you set the value no
when working with geometry types other than parts with large number of small edges.
