diff --git a/EgtGraphics.rc b/EgtGraphics.rc
index 905cc4f..05d5b49 100644
Binary files a/EgtGraphics.rc and b/EgtGraphics.rc differ
diff --git a/EgtGraphics.vcxproj b/EgtGraphics.vcxproj
index fbb119c..8129c45 100644
--- a/EgtGraphics.vcxproj
+++ b/EgtGraphics.vcxproj
@@ -150,7 +150,7 @@ copy $(TargetPath) \EgtProg\DllD64</Command>
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
       <PrecompiledHeader>Use</PrecompiledHeader>
-      <Optimization>Full</Optimization>
+      <Optimization>MaxSpeed</Optimization>
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <IntrinsicFunctions>true</IntrinsicFunctions>
       <PreprocessorDefinitions>WIN32;I_AM_EGR;NDEBUG;_WINDOWS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
@@ -162,7 +162,7 @@ copy $(TargetPath) \EgtProg\DllD64</Command>
       <DisableSpecificWarnings>
       </DisableSpecificWarnings>
       <EnableEnhancedInstructionSet>StreamingSIMDExtensions2</EnableEnhancedInstructionSet>
-      <OmitFramePointers>false</OmitFramePointers>
+      <OmitFramePointers>true</OmitFramePointers>
     </ClCompile>
     <Link>
       <SubSystem>Windows</SubSystem>
@@ -182,7 +182,7 @@ copy $(TargetPath) \EgtProg\Dll32</Command>
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
       <PrecompiledHeader>Use</PrecompiledHeader>
-      <Optimization>Full</Optimization>
+      <Optimization>MaxSpeed</Optimization>
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <IntrinsicFunctions>true</IntrinsicFunctions>
       <PreprocessorDefinitions>WIN32;I_AM_EGR;NDEBUG;_WINDOWS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
@@ -193,7 +193,7 @@ copy $(TargetPath) \EgtProg\Dll32</Command>
       <OpenMPSupport>true</OpenMPSupport>
       <DisableSpecificWarnings>
       </DisableSpecificWarnings>
-      <OmitFramePointers>false</OmitFramePointers>
+      <OmitFramePointers>true</OmitFramePointers>
       <EnableEnhancedInstructionSet>NotSet</EnableEnhancedInstructionSet>
     </ClCompile>
     <Link>
diff --git a/OpenGL.h b/OpenGL.h
index 58361ea..2e40e7b 100644
--- a/OpenGL.h
+++ b/OpenGL.h
@@ -14,5 +14,6 @@
 #pragma once
 
 #define GLEW_MX
+#define NOMINMAX
 #include "/EgtDev/Extern/GLEW/Include/glew.h"
 #include "/EgtDev/Extern/GLEW/Include/wglew.h"
diff --git a/SceneBasic.cpp b/SceneBasic.cpp
index fd1334f..05b0047 100644
--- a/SceneBasic.cpp
+++ b/SceneBasic.cpp
@@ -666,10 +666,6 @@ Scene::Draw( void)
    glDepthFunc( GL_LEQUAL) ;
    glEnable( GL_DEPTH_TEST) ;
 
-  // disegno griglia senza illuminazione
-   glDisable( GL_LIGHTING) ;
-   DrawGrid() ;
-
   // aggiorno il colore di default
    if ( m_pGeomDB != nullptr)
       m_pGeomDB->GetDefaultMaterial( m_colDef) ;
@@ -682,6 +678,8 @@ Scene::Draw( void)
    case SM_WIREFRAME :
      // disabilito illuminazione
       glDisable( GL_LIGHTING) ;
+     // disegno griglia senza illuminazione (già impostato)
+      DrawGrid() ;
      // imposto disegno wireframe anche per poligoni
       glPolygonMode( GL_FRONT_AND_BACK, GL_LINE) ;
      // disegno le geometrie del DB in una sola passata
@@ -699,11 +697,16 @@ Scene::Draw( void)
       DrawGroup( GDB_ID_ROOT, 1, MdStMk( GDB_MD_STD, GDB_ST_ON, GDB_MK_OFF)) ;
       glColorMask( GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE) ;
       glDisable( GL_POLYGON_OFFSET_FILL) ;
+     // disegno griglia senza illuminazione (già impostato)
+      DrawGrid() ;
       // seconda passata per tutto in forma 0dim e curve
       glPolygonMode( GL_FRONT_AND_BACK, GL_LINE) ;
       DrawGroup( GDB_ID_ROOT, 2, MdStMk( GDB_MD_STD, GDB_ST_ON, GDB_MK_OFF)) ;
       break ;
    case SM_SHADING :
+     // disegno griglia senza illuminazione
+      glDisable( GL_LIGHTING) ;
+      DrawGrid() ;
      // imposto disegno shading per poligoni con davanti e dietro diversificati
       glPolygonMode( GL_FRONT_AND_BACK, GL_FILL) ;
       glLightModeli( GL_LIGHT_MODEL_TWO_SIDE, GL_TRUE) ;
diff --git a/SceneGrid.cpp b/SceneGrid.cpp
index 853f061..946a3f2 100644
--- a/SceneGrid.cpp
+++ b/SceneGrid.cpp
@@ -15,8 +15,8 @@
 #include "stdafx.h"
 #include "Scene.h"
 #include "EGrUtils.h"
-
-
+#include <algorithm>
+                    
 using namespace std ;
 
 //----------------------------------------------------------------------------
@@ -33,7 +33,7 @@ bool
 Scene::SetGridGeo( double dSnapStep, int nMinLineSstep, int nMajLineSstep, int nExtSstep)
 {
    const double MIN_SNAP_STEP = 0.1 ;
-   m_dSnapStep = max( fabs( dSnapStep), MIN_SNAP_STEP) ;
+   m_dSnapStep = std::max( fabs( dSnapStep), MIN_SNAP_STEP) ;
    m_nMinLineSstep = abs( nMinLineSstep) ;
    m_nMajLineSstep = abs( nMajLineSstep) ;
    m_nExtSstep = abs( nExtSstep) ;