Maximized windowed borderless at lower than native resolution?

[mojstermiha]

Is there a way to expand the window size when in windowed or windowed-borderless but at a lower than monitor native resolution? Reason is, endgame really slowed down in fastest mode on my 4K monitor and even with high-end PC it is too slow for comfortable playing.

This is what I have tried so far with C#:

//Definition for Window Placement Structure
[StructLayout(LayoutKind.Sequential)]       
private struct WINDOWPLACEMENT
{
   public int length;
   public int flags;
   public int showCmd;
   public System.Drawing.Point ptMinPosition;
   public System.Drawing.Point ptMaxPosition;
   public System.Drawing.Rectangle rcNormalPosition;
}

[DllImport("user32.dll")]
private static extern bool ShowWindowAsync(IntPtr hWnd, int nCmdShow);

[DllImport("user32.dll", SetLastError = true)]
private static extern bool MoveWindow(IntPtr hWnd, int X, int Y, int nWidth, int nHeight, bool bRepaint);

[DllImport("user32.dll")]
private static extern bool SetWindowPlacement(IntPtr hWnd, [In] ref WINDOWPLACEMENT lpwndpl);

[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
private static extern bool GetWindowPlacement(IntPtr hWnd, ref WINDOWPLACEMENT lpwndpl);

foreach (Process proc in Process.GetProcessesByName("stellaris")) {
   WINDOWPLACEMENT wp = new WINDOWPLACEMENT();
   GetWindowPlacement(proc.MainWindowHandle, ref wp);
   wp.showCmd = 3; //SW_SHOWMAXIMIZED = 3
   SetWindowPlacement(proc.MainWindowHandle, ref wp);
        
   ShowWindowAsync(proc.MainWindowHandle, 3);
   MoveWindow(proc.MainWindowHandle, 0, 0, 3840, 2160, true);
}

Nothing worked yet. MoveWindow is able to move the window with X and Y but not set size.

 

[Pancakelord]

When you say the endgame slowed down, does that mean you're able to play the early years fast at 4k?

Reason is, endgame really slowed down in fastest mode on my 4K monitor and even with high-end PC it is too slow for comfortable playing.

If so then its not a GPU issue, but rather a CPU issue and trying to downscale your resolution wont have a meaningful impact. (and that means those slowdowns are CPU bottlenecks - part of the game's ongoing performance problems, chiefly tied to vacant jobs, running checks each day, fleet pathing in late game with many ships in wars & maybe UI bottlenecks from the sheer number of station icons on huge galaxies lol - ive noticed slight frame rises when panning off the galaxy, or by disabling the UI fully but this impact is miniscule compared to the other 2 issues)