The new patch improved, but not in a regular and constant way.
Example, if I have a new city, ok, it's empty, 60 fps. I build a workshop, 11fps... but only for like 5 seconds, and just after it comes to 50fps, without moving the view.
And in general the performance goes this way. It looks like the rendering has been improved, but only after an initial time to load a new element, for some reason.
In the end, it makes the game choppy, and still not pleasant to play, unfortunately. Because the slowdowns seem to happen very irregularly now. My FRAPS graph is a rollercoaster, jumping from the top to bottom.