pcbnew: fix very slowly hands place module at ratsnest visible off

pcbnew/modules.cpp

@@ -478,6 +478,7 @@ void WinEDA_BasePcbFrame::Place_Module( MODULE* module,
     DrawPanel->ManageCurseur = NULL;
     DrawPanel->ForceCloseManageCurseur = NULL;
 
+    if( GetBoard()->IsElementVisible( RATSNEST_VISIBLE ) )
         if( !aDoNotRecreateRatsnest )
             Compile_Ratsnest( DC, true );
 
@@ -541,6 +542,7 @@ void WinEDA_BasePcbFrame::Rotate_Module( wxDC* DC, MODULE* module,
         {
             //  not beiing moved: redraw the module and update ratsnest
             module->Draw( DrawPanel, DC, GR_OR );
+            if( GetBoard()->IsElementVisible( RATSNEST_VISIBLE ) )
                 Compile_Ratsnest( DC, true );
         }
         else