Grassmaster, I think they fixed the slider problems in patch 1.1 which is supposed to be in the download versions by now. I can't find the patch notes again. There is a huge amount of changes in the patch notes for 1.1 if you can find them.
Edit: (Oops. They did not fix the slider problems in 1.1. Many other problems are emerging as players now begin to comment on the full released game. I think this game will need several patch levels, perhaps some expansions and user mods too.)
HoI 3 puts all the graphics work onto the GPU, leaving the CPU to handle all the calculations. Thus, your GPU will get a major workout and you need a hefty GPU with 512. Think the recommended is an 8800. That being said, even those with the best available systems are finding it slow compared to HoI 2. Optimizations are promised but will probably take some time.
I do not understand why they made the graphics 3D. The only reason you want 3D is so you can look at 3D sprites, tiny little tanks and such. But to get framerate and game speed, you will probably switch to the standard strategy map counters, just little stacks of postage stamp squares. Why do you need 3D to look at little flat squares? The map as a whole does not look good to me. There are a lot of colorings you can do for various categories, but in normal mode it just looks drab and sort of depressing.
The demo really is strange. The tutorial just shows you where things are. Then you get a choice of four scenarios, each one dropping you into a war with more complications to deal with than a long tailed cat in a room full of rocking chairs. Good way to scare off potential players who are not too bright, such as I'm. I suspect that they designed the demo to appeal to the beta testers, all of whom felt that allowing a prospective customer to start with a small out of the line of fire country and build things up from scratch would be too boring. No, let them find themselves suddenly thrown into the proverbial stinking waterway without a means of locomotion! har har har
On the positive side, it does look like once it has its rough edges worn off by patches and perhaps some mods it will be a great game, if you like moving little postage stamps around. Meanwhile I would suggest to anyone considering it that you spend some time on the forums reading threads including the technical ones to make sure it will work on your equipment.
Paradox really does care about this game. Johan and the devs are up there along with some really sharp moderators. The threads are interesting to say the least.
http://forum.paradoxplaza.com/forum/forumdisplay.php?f=415