HANA calculation view performance tips

Hi HANA experts,

I'm developing a calculation view and need some suggestions about designing and performance optimization.

In my calculation view I need to UNION several Analytical Views that are all joined (with the same join) to a table containing a column that will be added to the Output of the calculation view.

My question is: it is more performant to implement the Calculation View like in figure 1 (The join is made after the union) or like in fig 2 (the same table and join are replicated for each Analytical view, before the union)?

And Why?

Thank you very much for your answers.

I would really appreciate any insight about how the calculation engine works and how performances can be increased.

Fig 1

Fig 2