Why the game runs so well in window mode???

[ParaB]

Why shouldn't it? The lower the resolution, the less pixels the system has to render, the higher the FPS.

Nothing surprising here.

[Buchon]

Less pixels = less GPU power and VRAM required.

This game requires GPU, in both camps, GPU power and VRAM.

Through Im very happy with the performance of my GPU in this game, I can play at 1920x1200 with AAx4 well.