Running HoI3 on a Phenom II X3 720 with no overclocking and 2 GB RAM on Vista, and I would say that the game runs HOI well. The max speed seems slow, but I haven't experienced any real slowdown as the game progresses so it's running fairly steadily. I have a 9600GT from last year, but that's not the issue. The game is not graphics intensive at all, the performance really depends on your CPU and processor
IMHO, if you want to run the game very smoothly, you need at least a dual-core and 2 GB RAM on XP, 3 GB on Vista. The game used around 800 MB memory for me, which is a huge amount considering that on my computer, Vista alone uses around 700 MB of memory. So when the game progress to later stages, I might very well run out of memory.
But really, the workload for the CPU is amazing: This game has 14,000 provinces to keep track of. The game re-calculates the temperature and pressure and computes the resulting weather for
every single one of those provinces, every single game hour.That's a lot of calculations.
Not to mention that later in the game, there will be literally thousands of brigades running around. If you command at the corps level, you're forcing your computer to run a lot more AI in addition to the 70+ AI the game already runs to manage other nations. Obviously, that's a lot of calculations to run the rather complex decision trees etc for dozens and dozens of individual AI.
The spreadsheet game essentially has become as resource demanding as a shooter because the graphics are processed in the same way under the hood.
No, by offloading the graphics processing to the graphics card they've improved performance--at worst, they haven't decreased it. The graphics in HOI3 are basic and dated. Considering that in HOI2 there was no demand placed on the GPU, the GPU represented unused potential. So, since everyone has a GPU that can run the basic graphics of HOI3, they just offloaded the graphics to the graphics card, so that the GPU can take a bit of strain off the rather overworked CPU.
But good try, attempting to compare the resource demands of Call of Duty's graphics to HOI3's graphics.
If Paradox were to simplify the weather system back to the perfectly acceptable one that HoI2 had (which they won't because then they'd be admitting they wasted thousands of dollars of development time) and further optimized the game for multicore support (which they probably will do in patches), we would have much better performance I bet.