Unfortunately, I'm getting a significant decrease in performance in Elemental from 1.19.
Here is my dxdiag: http://pastebin.com/fQPzEkEt
My description of the problem will be vague, because I can't back it up with hard numbers. Menus and loading within the game seems to take much longer now, than in 1.11.
For example, in 1.11 I could load up the game and - once it started - press "New game" and literally spam the "next" button location to hop through the menus and be on the loading screen in a second. This now takes 5-10 seconds, with the FPS dropping to 0 for almost a second while selecting a new sovereign or faction to play as.
Another example - I would enter the game once started, after the loading screen. As soon as the loading screen was gone, I would immediately be presented with the world as it should look. In 1.19, it suddenly takes 3-4 seconds to finish loading when I am in the game.
Another example - switching between sovereigns when choosing one before a game used to be instant. Now, every time I click a new one the game drops to 0 FPS for about a second.
I know this sounds ridiculously small, but it all "adds up" in time spent waiting for the game to load. I build a city, every menu that appears used to be instant - now takes a second. I close it, the game drops to 0 fps for half a second.
In addition, the FPS of the game now appears to stutter frequently. In 1.11, my gameplay was almost completely smooth (with stutters only occuring when I switch between cloth map and non-cloth map). Now, these stutters appear once every few seconds for no apparent reason.
I'm not sure what information I should provide that can help you pinpoint this issue, please let me know if I can supply any.
Edit: Youtube videos
patch 1.11
patch 1.19