I don't even know if that's true. I have an AMD laptop that dual-boots Fedora KDE and Windows 11. When I watch videos (local files) on both, I can get about the

I don't even know if that's true. I have an AMD laptop that dual-boots Fedora KDE and Windows 11. When I watch videos (local files) on both, I can get about the same battery life. But Linux, in general, is much worse with OpenGL/Vulkan applications (games, primarily). With Chrome, Windows is slightly better; with Firefox, Linux is significantly better. But Chrome on Windows is generally "best". Etc. So it's going to be application specific as much as small things like hardware configuration differences in each OS (which can be tailored to match).