SetWindowsHookEx with WH_MOUSE_LL slows down the mouse for several seconds

Question

I am using the following code to get mouse messages on the current process.

using (Process curProcess = Process.GetCurrentProcess())
using (ProcessModule curModule = curProcess.MainModule)
{
    return SetWindowsHookEx(WH_MOUSE_LL, proc, GetModuleHandle(curModule.ModuleName), 0);
}

For some reason when this code runs the mouse get slow for several seconds and then back to normal.

Any ideas?
Thanks

EDIT - hook method

private static IntPtr mouseEvent(int nCode, IntPtr wParam, IntPtr lParam)
{
    if (nCode >= 0 && MouseMessages.WM_LBUTTONDOWN == (MouseMessages)wParam)
    {
        MSLLHOOKSTRUCT hookStruct = (MSLLHOOKSTRUCT)Marshal.PtrToStructure(lParam, typeof(MSLLHOOKSTRUCT));     
        LastLeftClick = new ClickInfo { Time = DateTime.Now, X = hookStruct.pt.x, Y = hookStruct.pt.y };
    }
    return CallNextHookEx(hookID, nCode, wParam, lParam);
}

public class ClickInfo
{
    public int X { get; set; }
    public int Y { get; set; }
    public DateTime Time { get; set; }
}

Answer 1

I had the same problem (only it's c++ project, not c#) and resolved it by changing hook from WH_MOUSE_LL to WH_MOUSE (from low-level to normal level). For WM_LBUTTONUP and WM_RBUTTONUP messages it works ok.

The thing that amuses me is that code with WH_MOUSE_LL was doing fine at the time I wrote it (no mouse freezes etc.) It seems like some security update for Windows changed the behavior of the mouse hooks and previously fine code become a problem.