I'll loan this thread becouse I'm having same issues.
Firstly my pc specs:
CPU: E8400, dual core at 3.2Ghz
Graphics: Ati Radeon HD4870 1Gb
RAM: 4Gb (of which my 32bit winXP can utilize 3.3Gb)
So my PC is fairly modern and I have kept it tidy/clean/defragged and so on. It can run pretty much all brand new games with high graphic settings. I surely wasn't expecting older game like SC4 to give it such a hard time.
For example my biggest city this far, which has about 350,000 citizens is almost unplayable if you make the mistake and zoom further away. All together its not enjoyable to play any larger city becouse of any quick movement across the map or zooming, or even laying a longer road is very, very slow and sluggish.
Here are my current settings (note that the resolution is custom widescreen)
Is there anything I can do about this issue or is it just the coding of the game? For example does SC4 utilize multiple cores of your CPU or only one?
Thanks if anyone can help.