lossless is a small program which perform frame generation. For example, over city like berlin and plenty of aircraft in IL2 with max setting, I have 18 to 25 fps on my system. With lossless, you can double the fps. To do that, you have to launch IL2 in windowed mode (I did that through il2setup.exe) then I set my native screen resolution in conf.ini.
You launch lossless, then il2 in windowed mode, in game you activate lossless with CTL left ALT left S then you are go to go with a fluid game. It work with every game or application (DCS, XPLANE 12, FS 2024, X4 foundation....)
It is a great software which cost 6 euro on steam!!!!
You do not need to launch steam to use it, just make a shortcut to C:\Program Files (x86)\Steam\steamapps\common\Lossless Scaling\LosslessScaling.exe.
Combined with graphic extender 0.30, IL2 1946 is still one of the best flight sim even after more than 20 years!!!
Regards to the community.