diff --git a/firmware/application/CMakeLists.txt b/firmware/application/CMakeLists.txt
index 9e03d737..a2288e00 100644
--- a/firmware/application/CMakeLists.txt
+++ b/firmware/application/CMakeLists.txt
@@ -230,6 +230,7 @@ set(CPPSRC
 	apps/ui_nrf_rx.cpp
 	apps/ui_aprs_tx.cpp
 	apps/ui_bht_tx.cpp
+	apps/ui_dfu_menu.cpp
 	apps/ui_coasterp.cpp
 	apps/ui_debug.cpp
 	apps/ui_encoders.cpp
diff --git a/firmware/application/apps/ui_dfu_menu.cpp b/firmware/application/apps/ui_dfu_menu.cpp
new file mode 100644
index 00000000..5d127b07
--- /dev/null
+++ b/firmware/application/apps/ui_dfu_menu.cpp
@@ -0,0 +1,105 @@
+/*
+ * Copyright (C) 2023 Bernd Herzog
+ *
+ * This file is part of PortaPack.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include "ui_dfu_menu.hpp"
+#include "portapack_shared_memory.hpp"
+
+namespace ui {
+
+DfuMenu::DfuMenu(NavigationView& nav) : nav_ (nav) {
+	add_children({
+		&text_head,
+		&labels,
+		&text_info_line_1,
+		&text_info_line_2,
+		&text_info_line_3,
+		&text_info_line_4,
+		&text_info_line_5,
+		&text_info_line_6,
+		&text_info_line_7
+	});
+}
+
+void DfuMenu::paint(Painter& painter) {
+	auto now = chTimeNow();
+	auto idle_ticks = chThdGetTicks(chSysGetIdleThread());
+	
+	static systime_t last_time;
+	static systime_t last_last_time;
+
+	auto time_elapsed = now - last_time;
+	auto idle_elapsed = idle_ticks - last_last_time;
+
+	last_time = now;
+	last_last_time = idle_ticks;
+
+	text_info_line_1.set(to_string_dec_uint(chCoreStatus(), 6));
+	text_info_line_2.set(to_string_dec_uint((uint32_t)get_free_stack_space(), 6));
+	text_info_line_3.set(to_string_dec_uint((time_elapsed - idle_elapsed) / 10, 6));
+	text_info_line_4.set(to_string_dec_uint(shared_memory.m4_heap_usage, 6));
+	text_info_line_5.set(to_string_dec_uint(shared_memory.m4_stack_usage, 6));
+	text_info_line_6.set(to_string_dec_uint(shared_memory.m4_cpu_usage, 6));
+	text_info_line_7.set(to_string_dec_uint(chTimeNow()/1000, 6));
+
+	constexpr auto margin = 5;
+
+	painter.fill_rectangle(
+		{
+			{6 * CHARACTER_WIDTH - margin, 3 * LINE_HEIGHT - margin},
+			{15 * CHARACTER_WIDTH + margin * 2, 9 * LINE_HEIGHT + margin * 2}
+		},
+		ui::Color::black()
+	);
+
+	painter.fill_rectangle(
+		{
+			{5 * CHARACTER_WIDTH - margin, 3 * LINE_HEIGHT - margin},
+			{CHARACTER_WIDTH, 9 * LINE_HEIGHT + margin * 2}
+		},
+		ui::Color::dark_cyan()
+	);
+
+	painter.fill_rectangle(
+		{
+			{21 * CHARACTER_WIDTH + margin, 3 * LINE_HEIGHT - margin},
+			{CHARACTER_WIDTH, 9 * LINE_HEIGHT + margin * 2}
+		},
+		ui::Color::dark_cyan()
+	);
+
+	painter.fill_rectangle(
+		{
+			{5 * CHARACTER_WIDTH - margin, 3 * LINE_HEIGHT - margin - 8},
+			{17 * CHARACTER_WIDTH + margin * 2, 8}
+		},
+		ui::Color::dark_cyan()
+	);
+
+	painter.fill_rectangle(
+		{
+			{5 * CHARACTER_WIDTH - margin, 12 * LINE_HEIGHT + margin},
+			{17 * CHARACTER_WIDTH + margin * 2, 8}
+		},
+		ui::Color::dark_cyan()
+	);
+}
+
+} /* namespace ui */
diff --git a/firmware/application/apps/ui_dfu_menu.hpp b/firmware/application/apps/ui_dfu_menu.hpp
new file mode 100644
index 00000000..9c2fa1a7
--- /dev/null
+++ b/firmware/application/apps/ui_dfu_menu.hpp
@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2023 Bernd Herzog
+ *
+ * This file is part of PortaPack.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __UI_DFU_MENU_H__
+#define __UI_DFU_MENU_H__
+
+#include <cstdint>
+
+#include "ui_widget.hpp"
+#include "event_m0.hpp"
+#include "debug.hpp"
+#include "string_format.hpp"
+
+#define LINE_HEIGHT 16
+#define CHARACTER_WIDTH 8
+
+namespace ui {
+class NavigationView;
+
+class DfuMenu : public View {
+public:
+	DfuMenu(NavigationView& nav);
+	~DfuMenu() = default;
+
+	void paint(Painter& painter) override;
+
+private:
+	NavigationView& nav_;
+	
+	Text text_head {{ 6 * CHARACTER_WIDTH, 3 * LINE_HEIGHT, 11 * CHARACTER_WIDTH, 1 * LINE_HEIGHT }, "Performance"};
+
+	Labels labels {
+		{ { 6 * CHARACTER_WIDTH, 5 * LINE_HEIGHT }, "M0 heap:", Color::dark_cyan() },
+		{ { 6 * CHARACTER_WIDTH, 6 * LINE_HEIGHT }, "M0 stack:", Color::dark_cyan() },
+		{ { 6 * CHARACTER_WIDTH, 7 * LINE_HEIGHT }, "M0 cpu %:", Color::dark_cyan() },
+		{ { 6 * CHARACTER_WIDTH, 8 * LINE_HEIGHT }, "M4 heap:", Color::dark_cyan() },
+		{ { 6 * CHARACTER_WIDTH, 9 * LINE_HEIGHT }, "M4 stack:", Color::dark_cyan() },
+		{ { 6 * CHARACTER_WIDTH,10 * LINE_HEIGHT }, "M4 cpu %:", Color::dark_cyan() },
+		{ { 6 * CHARACTER_WIDTH,11 * LINE_HEIGHT }, "uptime:", Color::dark_cyan() }
+	};
+
+	Text text_info_line_1 {{ 15 * CHARACTER_WIDTH, 5 * LINE_HEIGHT, 5 * CHARACTER_WIDTH, 1 * LINE_HEIGHT }, ""};
+	Text text_info_line_2 {{ 15 * CHARACTER_WIDTH, 6 * LINE_HEIGHT, 5 * CHARACTER_WIDTH, 1 * LINE_HEIGHT }, ""};
+	Text text_info_line_3 {{ 15 * CHARACTER_WIDTH, 7 * LINE_HEIGHT, 5 * CHARACTER_WIDTH, 1 * LINE_HEIGHT }, ""};
+	Text text_info_line_4 {{ 15 * CHARACTER_WIDTH, 8 * LINE_HEIGHT, 5 * CHARACTER_WIDTH, 1 * LINE_HEIGHT }, ""};
+	Text text_info_line_5 {{ 15 * CHARACTER_WIDTH, 9 * LINE_HEIGHT, 5 * CHARACTER_WIDTH, 1 * LINE_HEIGHT }, ""};
+	Text text_info_line_6 {{ 15 * CHARACTER_WIDTH,10 * LINE_HEIGHT, 5 * CHARACTER_WIDTH, 1 * LINE_HEIGHT }, ""};
+	Text text_info_line_7 {{ 15 * CHARACTER_WIDTH,11 * LINE_HEIGHT, 5 * CHARACTER_WIDTH, 1 * LINE_HEIGHT }, ""};
+};
+
+} /* namespace ui */
+
+#endif/*__UI_DFU_MENU_H__*/
diff --git a/firmware/application/event_m0.cpp b/firmware/application/event_m0.cpp
index 583c4004..146492b9 100644
--- a/firmware/application/event_m0.cpp
+++ b/firmware/application/event_m0.cpp
@@ -43,6 +43,7 @@ using namespace lpc43xx;
 #include <array>
 
 #include "ui_font_fixed_8x16.hpp"
+#include "ui_navigation.hpp"
 
 extern "C" {
 
@@ -262,6 +263,8 @@ void EventDispatcher::on_touch_event(ui::TouchEvent event) {
 void EventDispatcher::handle_lcd_frame_sync() {
 	DisplayFrameSyncMessage message;
 	message_map.send(&message);
+
+	static_cast<ui::SystemView *>(top_widget)->paint_overlay();
 	painter.paint_widget_tree(top_widget);
 
 	portapack::backlight()->on();
@@ -304,7 +307,12 @@ void EventDispatcher::handle_switches() {
 		if( switches_state[i] ) {
 			const auto event = static_cast<ui::KeyEvent>(i);
 			if( !event_bubble_key(event) ) {
-				context.focus_manager().update(top_widget, event);
+				if (switches_state[(size_t)ui::KeyEvent::Dfu]) {
+					static_cast<ui::SystemView *>(top_widget)->toggle_overlay();
+				}
+				else {
+					context.focus_manager().update(top_widget, event);
+				}
 			}
 
 			in_key_event = true;
diff --git a/firmware/application/main.cpp b/firmware/application/main.cpp
index d9bef9fb..7af337ec 100755
--- a/firmware/application/main.cpp
+++ b/firmware/application/main.cpp
@@ -145,14 +145,14 @@ Continuous (Fox-oring)
 rffc507x::RFFC507x first_if;
 
 static void event_loop() {
-	ui::Context context;
-	ui::SystemView system_view {
+	static ui::Context context;
+	static ui::SystemView system_view {
 		context,
 		portapack::display.screen_rect()
 	};
 
 	EventDispatcher event_dispatcher { &system_view, context };
-	MessageHandlerRegistration message_handler_display_sleep {
+	static MessageHandlerRegistration message_handler_display_sleep {
 		Message::ID::DisplaySleep,
 		[&event_dispatcher](const Message* const) {
 			event_dispatcher.set_display_sleep(true);
diff --git a/firmware/application/ui_navigation.cpp b/firmware/application/ui_navigation.cpp
index 179e734f..1870b126 100644
--- a/firmware/application/ui_navigation.cpp
+++ b/firmware/application/ui_navigation.cpp
@@ -29,6 +29,7 @@
 #include "bmp_splash.hpp"
 #include "bmp_modal_warning.hpp"
 #include "portapack_persistent_memory.hpp"
+#include "portapack_shared_memory.hpp"
 
 #include "ui_about_simple.hpp"
 #include "ui_adsb_rx.hpp"
@@ -748,6 +749,36 @@ Context& SystemView::context() const {
 	return context_;
 }
 
+void SystemView::toggle_overlay() {
+	if (overlay_active){
+		this->remove_child(&this->overlay);
+		this->set_dirty();
+		shared_memory.request_m4_performance_counter = 0;
+	}
+	else{
+		this->add_child(&this->overlay);
+		this->set_dirty();
+		shared_memory.request_m4_performance_counter = 1;
+		shared_memory.m4_cpu_usage = 0;
+		shared_memory.m4_heap_usage = 0;
+		shared_memory.m4_stack_usage = 0;
+	}
+
+	overlay_active = !overlay_active;
+}
+
+void SystemView::paint_overlay() {
+	static bool last_paint_state = false;
+	if (overlay_active){
+		// paint background only every other second
+		if ((((chTimeNow()>>10) & 0x01) == 0x01) == last_paint_state)
+			return;
+
+		last_paint_state = !last_paint_state;
+		this->overlay.set_dirty();
+	}
+}
+
 /* ***********************************************************************/
 
 void BMPView::focus() {
diff --git a/firmware/application/ui_navigation.hpp b/firmware/application/ui_navigation.hpp
index aecce49f..6a8d9b8f 100644
--- a/firmware/application/ui_navigation.hpp
+++ b/firmware/application/ui_navigation.hpp
@@ -33,6 +33,7 @@
 #include "ui_channel.hpp"
 #include "ui_audio.hpp"
 #include "ui_sd_card_status_view.hpp"
+#include "ui_dfu_menu.hpp"
 
 #include "bitmap.hpp"
 #include "ff.h"
@@ -290,10 +291,15 @@ namespace ui
 			const Rect parent_rect);
 
 		Context &context() const override;
+		void toggle_overlay();
+		void paint_overlay();
 
 	private:
+		bool overlay_active {false};
+
 		SystemStatusView status_view{navigation_view};
 		InformationView info_view{navigation_view};
+		DfuMenu overlay{navigation_view};
 		NavigationView navigation_view{};
 		Context &context_;
 	};
diff --git a/firmware/baseband/chconf.h b/firmware/baseband/chconf.h
index 0ad24529..f5b45196 100755
--- a/firmware/baseband/chconf.h
+++ b/firmware/baseband/chconf.h
@@ -508,6 +508,8 @@
 }
 #endif
 
+
+
 /**
  * @brief   System tick event hook.
  * @details This hook is invoked in the system tick handler immediately
@@ -516,6 +518,8 @@
 #if !defined(SYSTEM_TICK_EVENT_HOOK) || defined(__DOXYGEN__)
 #define SYSTEM_TICK_EVENT_HOOK() {                                          \
   /* System tick event code here.*/                                         \
+  extern void update_performance_counters();  \
+  update_performance_counters();  \
 }
 #endif
 
diff --git a/firmware/baseband/debug.cpp b/firmware/baseband/debug.cpp
index f69f4053..450c9bce 100644
--- a/firmware/baseband/debug.cpp
+++ b/firmware/baseband/debug.cpp
@@ -116,5 +116,35 @@ CH_IRQ_HANDLER(HardFaultVector) {
 #endif
 }
 
+void update_performance_counters() {
+	auto performance_counter_active = shared_memory.request_m4_performance_counter;
+	if (performance_counter_active == 0x00)
+		return;
+	static bool last_paint_state = false;
+	if ((((chTimeNow()>>10) & 0x01) == 0x01) == last_paint_state)
+		return;
+
+	last_paint_state = !last_paint_state;
+
+	auto now = chTimeNow();
+	auto idle_ticks = chThdGetTicks(chSysGetIdleThread());
+	
+	static systime_t last_time;
+	static systime_t last_last_time;
+
+	auto time_elapsed = now - last_time;
+	auto idle_elapsed = idle_ticks - last_last_time;
+
+	last_time = now;
+	last_last_time = idle_ticks;
+
+	auto cpu_usage = (time_elapsed - idle_elapsed) / 10;
+	auto free_stack = (uint32_t)get_free_stack_space();
+	auto free_heap = chCoreStatus();
+
+	shared_memory.m4_cpu_usage = cpu_usage;
+	shared_memory.m4_stack_usage = free_stack;
+	shared_memory.m4_heap_usage = free_heap;
 }
 
+} /* extern "C" */
diff --git a/firmware/baseband/event_m4.cpp b/firmware/baseband/event_m4.cpp
index c1b395b2..ee0079eb 100644
--- a/firmware/baseband/event_m4.cpp
+++ b/firmware/baseband/event_m4.cpp
@@ -20,6 +20,7 @@
  */
 
 #include "event_m4.hpp"
+#include "debug.hpp"
 
 #include "portapack_shared_memory.hpp"
 
@@ -120,3 +121,4 @@ void EventDispatcher::handle_spectrum() {
 	const UpdateSpectrumMessage message;
 	baseband_processor->on_message(&message);
 }
+
diff --git a/firmware/baseband/sd_over_usb/proc_sd_over_usb.cpp b/firmware/baseband/sd_over_usb/proc_sd_over_usb.cpp
index 3645804e..01bcef05 100644
--- a/firmware/baseband/sd_over_usb/proc_sd_over_usb.cpp
+++ b/firmware/baseband/sd_over_usb/proc_sd_over_usb.cpp
@@ -45,3 +45,5 @@ int main() {
 
 	return 0;
 }
+
+void update_performance_counters() {}
diff --git a/firmware/common/portapack_shared_memory.hpp b/firmware/common/portapack_shared_memory.hpp
index 3235cef1..014c92db 100644
--- a/firmware/common/portapack_shared_memory.hpp
+++ b/firmware/common/portapack_shared_memory.hpp
@@ -64,6 +64,11 @@ struct SharedMemory {
 		JammerChannel jammer_channels[24];
 		uint8_t data[512];
 	} bb_data { { { { 0, 0 } }, 0, { 0 } } };
+
+	uint8_t volatile request_m4_performance_counter{ 0 };
+	uint8_t volatile m4_cpu_usage{ 0 };
+	uint16_t volatile m4_stack_usage{ 0 };
+	uint16_t volatile m4_heap_usage{ 0 };
 };
 
 extern SharedMemory& shared_memory;