I don’t know too much for Gemini (although I am really impressed by the politeness of these AI technology and their relevance in most cases).
As said, bending along a curve could be a little bit faster as in the example below, which takes around 70 s. Most of the time is taken by the method transform_by_vectorwhich takes 80% of the time.
There is a faster method, based on constructing all faces (via an Entity Builder). With the same railing and curve, it takes 23 s. However, you have to smooth the model manually at the end (doing it by API takes a long time, as there is no bulk method equivalent to the Soften edges tray panel).
Here is the model file
patos curvi.skp (4.1 MB)