Beware, this is only if you have a 64bits OS,
not your good old 32bits system with not more than 4Go RAM.
Maybe you have 8Go RAM on your pc (or even 16?).
Ageod games only use 2Go RAM! the rest should be for the swap..
Then, tell your games that they're no longer on a 32bits system!:
You can use Explorer Suite (however there are far more simple programs)
http://www.ntcore.com/exsuite.php
Install it
Right-click on a game .exe, or its shortcut.
Choose 'Open with CFF Explorer'
Click to the top-left on 'File Header'
Click to the bottom-right on 'Click here'
If not already ticked, click on 'App can handle >2gb address space'
Click OK button
Click to the top-left on the Save icon
Click Yes on Overwrite original file? window
You can quit the explorer
This tiny patch on the game exe does not harm it.
Your game should then run smoother, try to scroll the map.
I think Video RAM is now exchanging with usual RAM only
instead of with hard-drive swap often before... (I guess, I'm not an actual dev)