What is AllowFakefullScreen doing for me?

[Ashmer]

I am running the game at 2560x1600 and I have been messing around (I'm bored and have nothing better to do) with my graphics in either Very High or Ultra High settings.

In the UserPreferences.ini file under [Display] is the option of AllowFakeFullScreen=True/False

When set to "True" I get the fantastic graphics but the Frame Rates are in the 60-200 range. The game is playable with no lagging. This is the way I normally play the game.

When set to "False" I still get the great graphics and a Frame Rate of 80-300 range and an average of 120 FPS depending where I am at. However there is a graphic anomaly that is bugging the fool out of me. There are these horizontal "sparkly" lines around distant objects or around people or the hotbar icons. It also appears when the 2d turbine logo is displayed when starting the game.

My question is what is AllowFakeFullScreen doing that is "fixing" the problem when it is set to True?

I have also been wondering if this might be fixed when DX10 is implemented.


System:
XPS 720 Red A06 QX6700
2GB Corsair Dominator DDR2 SDRAM 800MHz OC'd to 1066MHz
Vista Ultimate 32bit SP1
1TB - Hitachi 7200RPM, SATA 3.0Gb/s, 32MB Cache
1TB - WD 7200RPM, SATA 3.0Gb/s
Dual 768MB Nvidia GeForce 8800 GTX
30 inch UltraSharp Widescreen Digital Flat Panel

[Altumus]

Fake full screen allows the game to display an ingame web browser - not sure on those little differences you are experiencing (the sparkly lines that is)