При установке Хука мыши все жестко тормозит

//mydll.h
 
#include <windows.h>
extern "C" _declspec(dllexport) void start();
 
 
//mydll.cpp
 
#include "mydll2.h"
 
 
HINSTANCE g_hinstDll = NULL;
HHOOK g_hhook = NULL;
 
 LRESULT CALLBACK LowLevelMouseProc(int nCode, WPARAM wParam, LPARAM lParam)
{
        if (nCode < 0)  // do not process message 
            return CallNextHookEx(g_hhook, nCode, wParam, lParam);
        switch(wParam)
        {
        case WM_MOUSEMOVE:
            int i;
            i=0;
            break;
        }
 
return  CallNextHookEx(g_hhook, nCode, wParam, lParam); 
}
 
 
static void Init()
{
    g_hhook = SetWindowsHookEx( WH_MOUSE_LL, (HOOKPROC)LowLevelMouseProc, (HINSTANCE)g_hinstDll, 0 );
}
 
 static void Cleanup()
{
    if( g_hhook != NULL )
        UnhookWindowsHookEx( g_hhook );
 
    g_hhook = NULL;
}
 
BOOL WINAPI DllMain(HINSTANCE hinstDll, DWORD fdwReason, PVOID fImpLoad) {
 
   switch (fdwReason) {
 
      case DLL_PROCESS_ATTACH:
         g_hinstDll = hinstDll;
         break;
        case DLL_PROCESS_DETACH:
        Cleanup();
        return TRUE;
   }
   return(TRUE);
} 
 
 
 
 
 
 
extern "C" _declspec(dllexport) void start()
{
    Init();
}
 
#ifdef _MANAGED
#pragma managed(pop)
#endif