Well, it is that, when I am scrolling the map, it is very jerky, like if it was staggering..

Ie: supposing we have a stable framerate, the map X position would be something like this:


0, 5, 10, 11, 18, 20, 29, 30, 31, 32, 33, 70, 72, 89, 90, 95, 100, 105, 150, 155, 156, 165...


Also sometimes when I press the arrow keys to scroll it scrolls very fast, sometimes it scrolls very slow.


I tried messing with the scrolling options, increasing the speed make the scrolling not usable at all (you always miss the mark of whatever you are trying to see), and enabling accelerating makes it less jerky, but make the initial scroll speed very, very, very slow... (and the "fix" to that is make the scrolling speed very fast, and when you need to see something at a medium distance you are screwed)

This could be due to one or more of numerous things (this small list is not exhaustive):

Insufficient dedicated video memory (VRAM)
Insufficient video power (integrated graphics?)
With the above in mind -- too high in-game graphics settings. Lower your graphics settings.

Running processes interfering with game functions, such as antivirus or other process intensive software -- close down all non essential programs, including things like IM, but especially graphic intensive programs, while playing games.

I have a laptop with nVidia Optimus, seemly despite me telling to use nVidia GPU it insists in giving the game the Intel GPU (or the Options menu claims so...)

I don't have any experience with Optimus, but you should be able to control which GPU any application uses from within the nVidia control panel, by editing the game profile, or creating a new profile.

From what little I understand about Optimus, that is how it works: switching from one GPU to another as load dictates. As I said, I don't have any experience with Optimus, but hopefully somebody who does will see your question and chime in.

I am having the same problem in SimCity 4.

It IS nVidia Optimus issue, mostly, that when Optimus was invented, nVidia explicitly had no intention of supporting DirectX 7 or 8, to the point that Optimus give completely wrong info, and respond to API calls in the wrong manner.

so basically, any game that use DirectX less than 9, there is no guarantee it will work with Optimus at all.

Dunno if you will see this. But I think Temple+ updates the application to use DirectX11.