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[Cyber Hunter]

Действительно, судя по release notes, если используете настройки Perfect и у вас RADEON 9600 XT/ RADEON 9800 XT, то с 4.2 на 4.3. и 4.4 пока не стоит переходить...

http://www.ati.com/support/infobase/4524.html
IL-2 Sturmovik : Forgotten Battles - performance decrease when set to "Perfect" mode
This issue affects the following system configurations:
RADEON 9600 XT/ RADEON 9800 XT products
CATALYST 4.3 and CATALYST 4.4 Display Drivers
When playing the game IL-2 Sturmovik with "Perfect" mode enabled, a noticable drop in performace will be noticed when compared to using CATALYST 4.2 display drivers.

ATI Engineering is aware of this issue and is investigating.

INFO-BASE#4524

KEYWORDS: RADEON 9600/9800 for PC IL-2 STURMOVIK FORGOTTEN BATTLES PEFORMANCE DECREASE