So far I am testing the part of script where I only create views and isolate elements. Familiy nstances are already placed in the project.
Once it works I will assemble the whole process where I will start from loading families and placing them to 0.0.0 and further create 3D views for each instance.
But wow, end-start transaction after views creation did help at current stage!
Now it seems to work well! Thank you!
As a side effect also this issue was fixed which is great 
GeniusLoci - 3DView Create - view creation issue after second launch - Packages - Dynamo (dynamobim.com)