diff --git a/EXE_NstCreateFlatParts.cpp b/EXE_NstCreateFlatParts.cpp
index 8d06027..9101b0c 100644
--- a/EXE_NstCreateFlatParts.cpp
+++ b/EXE_NstCreateFlatParts.cpp
@@ -89,6 +89,10 @@ ApproxCurveIfNeeded( IGdbIterator* pEnt, double dToler)
    PolyArc PA ;
    double dTol = max( dToler, LIN_TOL_FINE) ;
    bool bOk = pCrv->ApproxWithArcsEx( dTol, ANG_TOL_STD_DEG, LIN_FEA_STD, PA) && pCC->FromPolyArc( PA) ;
+   // eliminazione di small Z
+   bOk = bOk && pCC->RemoveSmallDefects( 0.5 * dTol, ANG_TOL_STD_DEG) ;
+   // merge di archi identici di biarchi
+   bOk = bOk && pCC->MergeCurves( 0.5 * dTol, ANG_TOL_STD_DEG) ;
    bOk = bOk && pEnt->GetGDB()->ReplaceGeoObj( pEnt->GetId(), Release( pCC)) ;
    return bOk ;
 }
diff --git a/EXeDllMain.cpp b/EXeDllMain.cpp
index 877bb98..3c7c802 100644
--- a/EXeDllMain.cpp
+++ b/EXeDllMain.cpp
@@ -36,7 +36,6 @@ const int STR_DIM = 50 ;
 
 //-----------------------------------------------------------------------------
 static HINSTANCE s_hModule = nullptr ;
-static char      s_szEXeNameVer[STR_DIM] ;
 
 //-----------------------------------------------------------------------------
 BOOL APIENTRY
@@ -71,10 +70,12 @@ DllMain( HMODULE hModule, DWORD dwReason, LPVOID lpReserved)
 const char*
 GetEXeVersion( void)
 {
-   std::string sVer ;
-
-   GetModuleVersion( s_hModule, sVer) ;
-   sprintf_s( s_szEXeNameVer, STR_DIM, "%s%s", EXE_STR, sVer.c_str()) ;
+   static char s_szEXeNameVer[STR_DIM] = "" ;
+   if ( s_szEXeNameVer[0] == '\0') {
+      std::string sVer ;
+      GetModuleVersion( s_hModule, sVer) ;
+      sprintf_s( s_szEXeNameVer, STR_DIM, "%s%s", EXE_STR, sVer.c_str()) ;
+   }
 
    return s_szEXeNameVer ;
 }