How to Make Cross Hair in C++.. Come Fast

//Www.MA-Programs.Com - Cross Hair
// By Mhemmad
#include "stadfx.h"
#include <windows.h>
#include <iostream>
#include <math.h>
using namespace std;

bool crosshairon=false;
HDC ragedc = NULL;
int crosshairsize=0;
int cx=0;
int cy=0;

void CrossThread(void)
{
	while(1)
	{
		if(GetAsyncKeyState(VK_NUMPAD0)&1)
		{
			crosshairon=!crosshairon;
			ragedc = GetDC(HWND_DESKTOP);
			cx=GetSystemMetrics(SM_CXSCREEN)/2-((crosshairsize-1)/2);
			cy=GetSystemMetrics(SM_CYSCREEN)/2-((crosshairsize-1)/2);
		}
		Sleep(1);
	}
}

int main()
{
	cout<<"Www.MA-Programs.Com _ Crosshair size in pixels:\n";
	cin>>crosshairsize;
	if(crosshairsize%2==0) //check if its even
	{
		crosshairsize+=1; //if it is add 1
	}
	system("cls"); // clear the console :)
	cout<<"Www.MA-Programs.Com _ Press numpad0 to toggle the crosshair on and off\n";
	CreateThread(0,0,(LPTHREAD_START_ROUTINE)CrossThread,0,0,0);
	while(1)
	{
		if(crosshairon==true)
		{
			for(int i=0;i<crosshairsize;i++)
			{
				SetPixel(ragedc, cx+i, cy+((crosshairsize-1)/2), RGB(255,0,0));
				SetPixel(ragedc, cx+((crosshairsize-1)/2), cy+i, RGB(255,0,0));
			}
		}
		Sleep(1);
	}
}