ok, I have used 5.10 & the latest omega one.
Got mixed results, with black terrain sometime.
I read somewhere here that making CIV4 process HIGH priority makes a difference.
So, I uninstalled omega (reboot), installed 5.11 (reboot), then made a batch file that loads the game at high priority... the impact was immidiate & awsome, my last save game that took a long time to load last time to less then a minute & the game run flawless & faster then before.
So, installing 5.11 + HIGH priority worked for me, although this is still one time experience, later I will play again.
in batch file I put:
cmd /c
cd "C:\Program Files\Firaxis Games\Sid Meier's Civilization 4"
start /High Civilization4.exe
Hope it works.
Oh, I have 9700pro