This application opens a window (no title bar or border) and types 012 based on keyboard input.
For some reason after compiling using g++, it takes 6-7 seconds to run (infact the icon of the executable takes 3-4 seconds to load after compiling, I have never seen that happen). The entire pc lags and the task manager also doesn’t show anything like memory leak or high cpu usage or anything.

include <windows.h>
#include <stdint.h>
#include <stdio.h>

#define glyph_width 5
#define glyph_height 5

int glyph[3][glyph_width * glyph_height] = {{0,1,1,0,0,
                                  1,0,1,1,0,
                              1,0,0,1,0,
                          1,1,0,1,0,
                          0,1,1,0,0},

                         {0,0,1,0,0,
                                  0,1,1,0,0,
                              0,0,1,0,0,
                          0,0,1,0,0,
                          0,1,1,1,0},

                         {0,1,1,0,0,
                                  1,0,0,1,0,
                              0,0,1,0,0,
                          0,1,0,0,0,
                          1,1,1,1,0}};

bool Running;
uint32_t* BitmapBuffer;
int BitmapWidth;
int BitmapHeight;

BITMAPINFO BitmapInfo;

uint32_t color = 0x00ffffff;
int box_x = 0;
int box_y = 0;

LRESULT CALLBACK WindowProcedure(HWND WindowHandle, uint32_t Message, WPARAM WParam, LPARAM LParam){
    LRESULT Result = 0;

    switch(Message){
        case WM_CREATE:{
            BitmapWidth = ((CREATESTRUCT*) LParam)->cx;
            BitmapHeight = ((CREATESTRUCT*) LParam)->cy;
            BitmapBuffer = (uint32_t*) VirtualAlloc(0, BitmapWidth * BitmapHeight * 4, MEM_COMMIT, PAGE_READWRITE);
            
            BitmapInfo.bmiHeader.biSize = sizeof(BITMAPINFO);
            BitmapInfo.bmiHeader.biWidth = BitmapWidth;
            BitmapInfo.bmiHeader.biHeight = -BitmapHeight;
            BitmapInfo.bmiHeader.biPlanes = 1;
            BitmapInfo.bmiHeader.biBitCount = 32;
            BitmapInfo.bmiHeader.biCompression = BI_RGB;
        } break;
        
        case WM_KEYDOWN:
        case WM_KEYUP:
        case WM_SYSKEYDOWN:
        case WM_SYSKEYUP:{
            uint16_t VKCode = (uint16_t) WParam;
            bool WasKeyDown = (LParam & (1 << 30));
            bool IsKeyDown = !(LParam & (1 << 31)); 
        
            if(IsKeyDown){
                for(int y = 0; y < glyph_height; y++){
                    for(int x = 0; x < glyph_width; x++){
                        if(glyph[VKCode - 48][y * glyph_width + x] == 1)
                        BitmapBuffer[(y + box_y * glyph_height) * BitmapWidth + (x + box_x * glyph_width)] = color;
                    }
                }
                box_x += 1;
            }
        } break;

        case WM_PAINT:{
            SetDIBitsToDevice(GetDC(WindowHandle), 0, 0, BitmapWidth, BitmapHeight, 0, 0, 0, BitmapHeight, BitmapBuffer, &BitmapInfo, DIB_RGB_COLORS);
        } break;
        
        default:{
            Result = DefWindowProc(WindowHandle, Message, WParam, LParam);
        }
    }

    return Result;
}

int main(){

    WNDCLASS WindowClass = {};
    WindowClass.lpfnWndProc = WindowProcedure;
    WindowClass.lpszClassName = "WindowClassName";
    WindowClass.hInstance = (HINSTANCE) GetModuleHandle(0);
    RegisterClass(&WindowClass);

    AllocConsole();
    freopen("conin$", "r", stdin);
    freopen("conout$", "w", stdout);
    freopen("conout$", "w", stderr);

    HWND Window = CreateWindow(WindowClass.lpszClassName, "Editor", WS_POPUP, 0, 0, 800, 800, 0, 0, WindowClass.hInstance, 0);
    
    ShowWindow(Window, 1);

    Running = true;
    while(Running){
        MSG Message = {};
        while(PeekMessage(&Message, 0, 0, 0, PM_REMOVE)){
            TranslateMessage(&Message);
            DispatchMessage(&Message);
        }
        
    }
}

I tried commenting peices of code and turns out the inner while(PeekMessage()) loop is the culprit. But without it the app does nothing except for appearing. I am using PeekMessage so I can draw on screen even without any messages. Why does this happen and what can I do to fix it?