Performance issue, very bad FPS and FPS drops

I made some screens from the places where the drops are damn extreme. 

http://abload.de/img/nfs142013-11-2719-50-6yxx6.png
http://abload.de/img/nfs142013-11-2719-51-khbrk.png

And those two positions are about here: http://abload.de/img/nfs142013-11-2719-50-helgz.png

Next:

http://abload.de/img/nfs142013-11-2720-03-xrita.png
And on the map: http://abload.de/img/nfs142013-11-2720-03-1icui.png

If you drive to the left directly next to that ship the framerate is just pain in the...head...definitly in the head...and nothing else ^^

Next: 

http://abload.de/img/nfs142013-11-2720-04-r0o3r.png
And on the map: http://abload.de/img/nfs142013-11-2720-04-fjrzk.png

This one is interesting. The Framerate makes a huge drop if you take the right way, but only if you drive in the direction you can see on the screenshot. If you COME from the direction you can see on that screenshot, the framerate still drops, but ist nearly 10FPS better than the direction you see at the screenshot.

Next one:

http://abload.de/img/nfs142013-11-2720-08-dpj7q.png
And on the map: http://abload.de/img/nfs142013-11-2720-08-3ejw7.png

And the last one:

http://abload.de/img/nfs142013-11-2720-09-88k74.png
And the map: http://abload.de/img/nfs142013-11-2720-09-i5kyf.png

That does not mean that the framerate only drops here. The 30 FPS doesn't get hold nearly everywhere in the game. There are some places in the far east where the framerate is much better. But I can't hold 30FPS constantly anywhere. 
These are only some places where the drops are just...crazy!