diff --git a/lib/Slic3r/GUI.pm b/lib/Slic3r/GUI.pm
index a50363131..2204ab03c 100644
--- a/lib/Slic3r/GUI.pm
+++ b/lib/Slic3r/GUI.pm
@@ -69,7 +69,9 @@ our $grey = Wx::Colour->new(200,200,200);
 
 # Events to be sent from a C++ menu implementation:
 # 1) To inform about a change of the application language.
-our $LANGUAGE_CHANGE_EVENT    = Wx::NewEventType;
+our $LANGUAGE_CHANGE_EVENT  = Wx::NewEventType;
+# 2) To inform about a change of Preferences.
+our $PREFERENCES_EVENT      = Wx::NewEventType;
 
 sub OnInit {
     my ($self) = @_;
@@ -122,6 +124,7 @@ sub OnInit {
         no_controller   => $self->{app_config}->get('no_controller'),
         no_plater       => $no_plater,
         lang_ch_event   => $LANGUAGE_CHANGE_EVENT,
+        preferences_event => $PREFERENCES_EVENT,
     );
     $self->SetTopWindow($frame);
 
@@ -146,6 +149,11 @@ sub OnInit {
     EVT_COMMAND($self, -1, $LANGUAGE_CHANGE_EVENT, sub{
         $self->recreate_GUI;
     });
+
+    # The following event is emited by the C++ menu implementation of preferences change.
+    EVT_COMMAND($self, -1, $PREFERENCES_EVENT, sub{
+        $self->update_ui_from_settings;
+    });
     
     return 1;
 }
@@ -158,6 +166,7 @@ sub recreate_GUI{
         no_controller   => $self->{app_config}->get('no_controller'),
         no_plater       => $no_plater,
         lang_ch_event   => $LANGUAGE_CHANGE_EVENT,
+        preferences_event => $PREFERENCES_EVENT,
     );
 
     if($topwindow)
diff --git a/lib/Slic3r/GUI/MainFrame.pm b/lib/Slic3r/GUI/MainFrame.pm
index 76920c17f..1b05218cd 100644
--- a/lib/Slic3r/GUI/MainFrame.pm
+++ b/lib/Slic3r/GUI/MainFrame.pm
@@ -50,6 +50,7 @@ sub new {
     $self->{no_plater} = $params{no_plater};
     $self->{loaded} = 0;
     $self->{lang_ch_event} = $params{lang_ch_event};
+    $self->{preferences_event} = $params{preferences_event};
 
     # initialize tabpanel and menubar
     $self->_init_tabpanel;
@@ -296,7 +297,9 @@ sub _init_menubar {
         $fileMenu->AppendSeparator();
         # Cmd+, is standard on OS X - what about other operating systems?
         $self->_append_menu_item($fileMenu, L("Preferences…\tCtrl+,"), L('Application preferences'), sub {
-            Slic3r::GUI::Preferences->new($self)->ShowModal;
+            # Slic3r::GUI::Preferences->new($self)->ShowModal;
+            # It's in C++ part now
+            Slic3r::GUI::open_preferences_dialog($self->{preferences_event});
         }, wxID_PREFERENCES);
         $fileMenu->AppendSeparator();
         $self->_append_menu_item($fileMenu, L("&Quit"), L('Quit Slic3r'), sub {
diff --git a/resources/localization/uk/Slic3rPE.mo b/resources/localization/uk/Slic3rPE.mo
index ff041bdee..1aea46283 100644
Binary files a/resources/localization/uk/Slic3rPE.mo and b/resources/localization/uk/Slic3rPE.mo differ
diff --git a/xs/src/slic3r/GUI/GUI.cpp b/xs/src/slic3r/GUI/GUI.cpp
index 394aca9ad..8c0f696e9 100644
--- a/xs/src/slic3r/GUI/GUI.cpp
+++ b/xs/src/slic3r/GUI/GUI.cpp
@@ -44,6 +44,7 @@
 #include "TabIface.hpp"
 #include "AppConfig.hpp"
 #include "Utils.hpp"
+#include "Preferences.hpp"
 
 namespace Slic3r { namespace GUI {
 
@@ -342,6 +343,12 @@ void add_debug_menu(wxMenuBar *menu, int event_language_change)
 //#endif
 }
 
+void open_preferences_dialog(int event_preferences)
+{
+	auto dlg = new PreferencesDialog(g_wxMainFrame, event_preferences);
+	dlg->ShowModal();
+}
+
 void create_preset_tabs(PresetBundle *preset_bundle,
 						bool no_controller, bool is_disabled_button_browse, bool is_user_agent,
 						int event_value_change, int event_presets_changed,
@@ -487,6 +494,13 @@ void show_info(wxWindow* parent, wxString message, wxString title){
 	msg_wingow->ShowModal();
 }
 
+void warning_catcher(wxWindow* parent, wxString message){
+	if (message == _L("GLUquadricObjPtr | Attempt to free unreferenced scalar") )
+		return;
+	auto msg = new wxMessageDialog(parent, message, _L("Warning"), wxOK | wxICON_WARNING);
+	msg->ShowModal();	
+}
+
 wxApp* get_app(){
 	return g_wxApp;
 }
@@ -536,4 +550,9 @@ int combochecklist_get_flags(wxComboCtrl* comboCtrl)
     return flags;
 }
 
+AppConfig* get_app_config()
+{
+	return g_AppConfig;
+}
+
 } }
diff --git a/xs/src/slic3r/GUI/GUI.hpp b/xs/src/slic3r/GUI/GUI.hpp
index 2ffacbc28..69a0f342c 100644
--- a/xs/src/slic3r/GUI/GUI.hpp
+++ b/xs/src/slic3r/GUI/GUI.hpp
@@ -66,7 +66,14 @@ void set_main_frame(wxFrame *main_frame);
 void set_tab_panel(wxNotebook *tab_panel);
 void set_app_config(AppConfig *app_config);
 
+AppConfig*	get_app_config();
+wxApp*		get_app();
+
 void add_debug_menu(wxMenuBar *menu, int event_language_change);
+
+// Create "Preferences" dialog after selecting menu "Preferences" in Perl part
+void open_preferences_dialog(int event_preferences);
+
 // Create a new preset tab (print, filament and printer),
 void create_preset_tabs(PresetBundle *preset_bundle, 
 						bool no_controller, bool is_disabled_button_browse,	bool is_user_agent,
@@ -81,6 +88,7 @@ void change_opt_value(DynamicPrintConfig& config, t_config_option_key opt_key, b
 
 void show_error(wxWindow* parent, wxString message);
 void show_info(wxWindow* parent, wxString message, wxString title);
+void warning_catcher(wxWindow* parent, wxString message);
 
 // load language saved at application config 
 bool load_language();
diff --git a/xs/src/slic3r/GUI/Tab.cpp b/xs/src/slic3r/GUI/Tab.cpp
index db23a1874..95eb83e87 100644
--- a/xs/src/slic3r/GUI/Tab.cpp
+++ b/xs/src/slic3r/GUI/Tab.cpp
@@ -904,7 +904,7 @@ void TabFilament::update()
 
 void TabFilament::OnActivate()
 {
-	m_volumetric_speed_description_line->SetText(PresetHints::maximum_volumetric_flow_description(*m_preset_bundle));
+	m_volumetric_speed_description_line->SetText(wxString::FromUTF8(PresetHints::maximum_volumetric_flow_description(*m_preset_bundle).c_str()));
 }
 
 wxSizer* Tab::description_line_widget(wxWindow* parent, ogStaticText* *StaticText)
diff --git a/xs/xsp/GUI.xsp b/xs/xsp/GUI.xsp
index ad4dd7550..cae480c2f 100644
--- a/xs/xsp/GUI.xsp
+++ b/xs/xsp/GUI.xsp
@@ -58,3 +58,6 @@ int combochecklist_get_flags(SV *ui)
 
 void set_app_config(AppConfig *app_config)
     %code%{ Slic3r::GUI::set_app_config(app_config); %};
+
+void open_preferences_dialog(int preferences_event)
+    %code%{ Slic3r::GUI::open_preferences_dialog(preferences_event); %};