In putting together an answer to Changing Multiple Influences Simultaneously I came across the Slow python script warning in the drivers editor

Using a set up as outlined here driving a pose bone's constraint influence with the armature objects "prop" property

Using a traditional driver variable

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And again using the use_self property of drivers. Since the drivers are on on pose bones, and the id data of a pose bone is the armature object then self.id_data is that object and self.id_data["prop"] (or self.id_data.get("prop", 0)) is the value of the custom property "prop" on that object.

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However this displays the Slow Python Expression warning

What are the implications of this warning? How is it flagged?

Could be related: (possibly another question) how much of self is self... In trying to game the system with drivers tried to manipulate the self.children via a parent object driver, only to find the collection empty in the driver namespace. The method also flagged the warning


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