creo6 config.pro option documentation for: INTF3D_IN_LOCK_REDISPLAY 
intf3d_in_lock_redisplay
yes
, no
*
Specifies whether to lock the redisplay of Creo Elements/Direct
models, especially relatively large Modeling assemblies, in their translation state while their import to Creo Parametric
is in progress.
yes
- Prevents the redisplay of Creo Elements/Direct
models during their import to Creo Parametric
. The models are displayed in the graphics window only when their import is complete.
no
- Does not lock or hide the redisplay of Creo Elements/Direct
models when their import to Creo Parametric
is in progress. This is the default.