New 1440p HDRMonitor extended from laptop bad stuttering from the moment loading game dcs xplane works fine. Tried everything I can think of

[CensoredMammal]

Hi guys,  I

[CensoredMammal]

• Lower the main monitor: Temporarily drop your main display to \(240\text{ Hz}\) or \(144\text{ Hz}\) in Windows settings. IL-2's legacy engine mathematically stabilizes much better at standard increments (\(120/144/240\text{ Hz}\)). [1, 2, 3]
• Turn off Hardware Acceleration: If you keep Discord, a browser, or video playing on the secondary monitor, turn off "Hardware Acceleration" in those app settings. This prevents them from drawing GPU priority away from IL-2. [1, 2, 3, 4]

2. Lock Your Frames Externally

Letting an older engine run uncapped at ultra-high frame rates causes devastating frame-time spikes. [1, 2]

• Open the NVIDIA Control Panel.
• Go to Manage 3D Settings > Program Settings and select IL-2 Sturmovik.
• Set Max Frame Rate to a locked number that your system can consistently hold, such as \(141\text{ FPS}\) or \(237\text{ FPS}\) (always stay \(3\text{ FPS}\) below your selected refresh rate to keep G-Sync active without adding VSync lag).
• Change Power management mode to Prefer maximum performance. [1, 2, 3]

3. Change Windows Graphics Preference [1]

Force Windows to ignore its own smart-scheduling and lock the 4070 into full performance mode for the game. [1]

• Open Windows Settings > System > Display > Graphics.
• Click Browse, find your Il-2 Sturmovik Battle of Stalingrad/bin/game/Il-2.exe file, and add it.
• Click Options, select High Performance (RTX 4070), and save. [1]

4. Adjust In-Game Screen Settings [1]

• Uncheck Fullscreen in the IL-2 graphics menu and run the game in Borderless Windowed mode. The game engine handles multi-monitor focus much better this way.
• Uncheck the in-game VSync. Use NVIDIA's Control Panel to handle vertical sync instead. [, 2, 3]

5. Disable Core 0/Threaded Optimisation

IL-2 uses an older DX11 engine architectural style that can choke on modern multi-core layouts.

• In your NVIDIA Control Panel profile for IL-2, turn Threaded Optimisation to Off. (This step alone has been known to fix stuttering on newer high-core CPUs). [1]