diff --git a/src/gui/components/cc_detailsline.cpp b/src/gui/components/cc_detailsline.cpp
index 6b49e3032..809e76491 100644
--- a/src/gui/components/cc_detailsline.cpp
+++ b/src/gui/components/cc_detailsline.cpp
@@ -88,7 +88,7 @@ CComponentsDetailsLine::~CComponentsDetailsLine()
 
 
 //paint details line with current parameters
-void CComponentsDetailsLine::paint(bool do_save_bg)
+void CComponentsDetailsLine::paint(const bool &do_save_bg)
 {
 	hide();
 	if (hasChanges())
diff --git a/src/gui/components/cc_detailsline.h b/src/gui/components/cc_detailsline.h
index 48f44635e..1194b767e 100644
--- a/src/gui/components/cc_detailsline.h
+++ b/src/gui/components/cc_detailsline.h
@@ -77,7 +77,7 @@ class CComponentsDetailsLine : public CComponents
 		void setLineWidth(const int& w){dl_w = w;}
 
 		///paint all to screen
-		void paint(bool do_save_bg = CC_SAVE_SCREEN_YES);
+		void paint(const bool &do_save_bg = CC_SAVE_SCREEN_YES);
 };
 
 #endif
diff --git a/src/gui/components/cc_draw.cpp b/src/gui/components/cc_draw.cpp
index bcdb1aaab..229c69289 100644
--- a/src/gui/components/cc_draw.cpp
+++ b/src/gui/components/cc_draw.cpp
@@ -498,7 +498,7 @@ void CCDraw::enablePaintCache(bool enable)
 }
 
 //paint framebuffer layers
-void CCDraw::paintFbItems(bool do_save_bg)
+void CCDraw::paintFbItems(const bool &do_save_bg)
 {
 	//Pick up signal if filled and execute slots.
 	OnBeforePaintLayers();
diff --git a/src/gui/components/cc_draw.h b/src/gui/components/cc_draw.h
index 51c27e4c4..3dd1f33ca 100644
--- a/src/gui/components/cc_draw.h
+++ b/src/gui/components/cc_draw.h
@@ -156,7 +156,7 @@ class CCDraw : public COSDFader, public CComponentsSignals, public CCTypes
 		///rendering of framebuffer elements at once,
 		///elements are contained in v_fbdata, presumes added frambuffer elements with paintInit(),
 		///parameter do_save_bg=true, saves background of element to pixel buffer, this can be restore with hide()
-		void paintFbItems(bool do_save_bg = true);
+		void paintFbItems(const bool &do_save_bg = true);
 
 	public:
 		///basic component class constructor.
@@ -306,7 +306,7 @@ class CCDraw : public COSDFader, public CComponentsSignals, public CCTypes
 		int getColBodyGradientMode(){return cc_body_gradient_enable;}
 
 		///abstract: paint item, arg: do_save_bg see paintInit() above
-		virtual void paint(bool do_save_bg = CC_SAVE_SCREEN_YES) = 0;
+		virtual void paint(const bool &do_save_bg = CC_SAVE_SCREEN_YES) = 0;
 		///paint item, same like paint(CC_SAVE_SCREEN_NO) but without any argument
 		void paint0(){paint(CC_SAVE_SCREEN_NO);}
 		///paint item, same like paint(CC_SAVE_SCREEN_YES) but without any argument
diff --git a/src/gui/components/cc_frm.cpp b/src/gui/components/cc_frm.cpp
index 4e27d304d..c160b1187 100644
--- a/src/gui/components/cc_frm.cpp
+++ b/src/gui/components/cc_frm.cpp
@@ -341,7 +341,7 @@ void CComponentsForm::exchangeCCItem(CComponentsItem* item_a, CComponentsItem* i
 	exchangeCCItem(getCCItemId(item_a), getCCItemId(item_b));
 }
 
-void CComponentsForm::paintForm(bool do_save_bg)
+void CComponentsForm::paintForm(const bool &do_save_bg)
 {
 	//paint body
 	if (!is_painted || force_paint_bg || shadow_force)
@@ -351,7 +351,7 @@ void CComponentsForm::paintForm(bool do_save_bg)
 	paintCCItems();
 }
 
-void CComponentsForm::paint(bool do_save_bg)
+void CComponentsForm::paint(const bool &do_save_bg)
 {
 	if(is_painted)
 		OnBeforeRePaint();
@@ -368,7 +368,7 @@ bool CComponentsForm::isPageChanged()
 	return false;
 }
 
-void CComponentsForm::paintPage(const uint8_t& page_number, bool do_save_bg)
+void CComponentsForm::paintPage(const uint8_t& page_number, const bool &do_save_bg)
 {
 	cur_page = page_number;
 	paint(do_save_bg);
@@ -724,3 +724,4 @@ int CComponentsForm::getUsedDX()
 
 	return x_res;
 }
+
diff --git a/src/gui/components/cc_frm.h b/src/gui/components/cc_frm.h
index b44cd5a66..1cee4ecb4 100644
--- a/src/gui/components/cc_frm.h
+++ b/src/gui/components/cc_frm.h
@@ -36,7 +36,7 @@ class CComponentsForm : public CComponentsItem
 {
 	protected:
 		std::vector<CComponentsItem*>	v_cc_items;
-		void paintForm(bool do_save_bg);
+		void paintForm(const bool &do_save_bg);
 		///generates next possible index for an item, see also cc_item_index, getIndex(), setIndex()
 		int genIndex();
 
@@ -77,7 +77,7 @@ class CComponentsForm : public CComponentsItem
 		virtual ~CComponentsForm();
 
 		///paints current form on screen, for paint a page use paintPage()
-		void paint(bool do_save_bg = CC_SAVE_SCREEN_YES);
+		void paint(const bool &do_save_bg = CC_SAVE_SCREEN_YES);
 
 		///same like CComponentsItem::kill(), but erases all embedded items inside of parent at once, this = parent
 		///NOTE: Items always have parent bindings to "this" and use the parent background color as default! Set parameter 'ignore_parent=true' to ignore parent background color!
@@ -170,7 +170,7 @@ class CComponentsForm : public CComponentsItem
 		///get current page
 		uint8_t getCurrentPage(){return cur_page;};
 		///paint defined page number 0...n
-		void paintPage(const uint8_t& page_number, bool do_save_bg = CC_SAVE_SCREEN_NO);
+		void paintPage(const uint8_t& page_number, const bool &do_save_bg = CC_SAVE_SCREEN_NO);
 		///enum page scroll modes
 		enum
 		{
diff --git a/src/gui/components/cc_frm_button.cpp b/src/gui/components/cc_frm_button.cpp
index 81df0ffdb..e8d282531 100644
--- a/src/gui/components/cc_frm_button.cpp
+++ b/src/gui/components/cc_frm_button.cpp
@@ -288,7 +288,7 @@ void CComponentsButton::initCCBtnItems()
 }
 
 
-void CComponentsButton::paint(bool do_save_bg)
+void CComponentsButton::paint(const bool &do_save_bg)
 {
 	//prepare items before paint
 	initCCBtnItems();
diff --git a/src/gui/components/cc_frm_button.h b/src/gui/components/cc_frm_button.h
index 272f86da8..f23be2014 100644
--- a/src/gui/components/cc_frm_button.h
+++ b/src/gui/components/cc_frm_button.h
@@ -173,7 +173,7 @@ class CComponentsButton : public CComponentsFrmChain, public CCTextScreen
 		void Refresh(){initCCBtnItems();};
 
 		///paint button object
-		void paint(bool do_save_bg = CC_SAVE_SCREEN_YES);
+		void paint(const bool &do_save_bg = CC_SAVE_SCREEN_YES);
 
 		/**
 		* Assigns a single event msg value to button object
diff --git a/src/gui/components/cc_frm_clock.cpp b/src/gui/components/cc_frm_clock.cpp
index 5f16adb3b..e7165427d 100644
--- a/src/gui/components/cc_frm_clock.cpp
+++ b/src/gui/components/cc_frm_clock.cpp
@@ -381,7 +381,7 @@ bool CComponentsFrmClock::Stop()
 	return false;
 }
 
-void CComponentsFrmClock::paint(bool do_save_bg)
+void CComponentsFrmClock::paint(const bool &do_save_bg)
 {
 	//prepare items before paint
 	initCCLockItems();
diff --git a/src/gui/components/cc_frm_clock.h b/src/gui/components/cc_frm_clock.h
index 86bb936d0..8680baeaa 100644
--- a/src/gui/components/cc_frm_clock.h
+++ b/src/gui/components/cc_frm_clock.h
@@ -159,7 +159,7 @@ class CComponentsFrmClock : public CComponentsForm, public CCTextScreen
 		void setClockInterval(const int& seconds){cl_interval = seconds;}
 
 		///show clock on screen
-		void paint(bool do_save_bg = CC_SAVE_SCREEN_YES);
+		void paint(const bool &do_save_bg = CC_SAVE_SCREEN_YES);
 		///hide clock on screen
 		void hide(){Stop(); CComponentsForm::hide();}
 		///does the same like kill() from base class, but stopping clock before kill
diff --git a/src/gui/components/cc_frm_ext_text.cpp b/src/gui/components/cc_frm_ext_text.cpp
index 239ba383a..d402bd984 100644
--- a/src/gui/components/cc_frm_ext_text.cpp
+++ b/src/gui/components/cc_frm_ext_text.cpp
@@ -229,7 +229,7 @@ void CComponentsExtTextForm::setLabelWidthPercent(const uint8_t& percent_val)
 	initCCTextItems();
 }
 
-void CComponentsExtTextForm::paint(bool do_save_bg)
+void CComponentsExtTextForm::paint(const bool &do_save_bg)
 {
 	//prepare items before paint
 	initCCTextItems();
diff --git a/src/gui/components/cc_frm_ext_text.h b/src/gui/components/cc_frm_ext_text.h
index 4e37efd0f..7c5edbe95 100644
--- a/src/gui/components/cc_frm_ext_text.h
+++ b/src/gui/components/cc_frm_ext_text.h
@@ -152,7 +152,7 @@ class CComponentsExtTextForm : public CComponentsForm, public CCTextScreen
 		Font* getFont(){return ccx_font;}
 
 		///paint this item/form
-		void paint(bool do_save_bg = CC_SAVE_SCREEN_YES);
+		void paint(const bool &do_save_bg = CC_SAVE_SCREEN_YES);
 };
 
 #endif
diff --git a/src/gui/components/cc_frm_footer.cpp b/src/gui/components/cc_frm_footer.cpp
index 858ee4c8b..dc4a40515 100644
--- a/src/gui/components/cc_frm_footer.cpp
+++ b/src/gui/components/cc_frm_footer.cpp
@@ -381,7 +381,7 @@ void CComponentsFooter::paintButtons(const int& x_pos,
 				     const int& label_width,
 				     const int& context_buttons,
 				     Font* font,
-				     bool do_save_bg)
+				     const bool &do_save_bg)
 {
 	this->setDimensionsAll(x_pos, y_pos, w, h);
 	this->setButtonFont(font);
diff --git a/src/gui/components/cc_frm_footer.h b/src/gui/components/cc_frm_footer.h
index 0691f411f..142eeeb80 100644
--- a/src/gui/components/cc_frm_footer.h
+++ b/src/gui/components/cc_frm_footer.h
@@ -143,7 +143,7 @@ class CComponentsFooter : public CComponentsHeader, public CCButtonSelect
 					const int& label_width = 0,
 					const int& context_buttons = 0,
 					Font* font = g_Font[SNeutrinoSettings::FONT_TYPE_BUTTON_TEXT],
-					bool do_save_bg = CC_SAVE_SCREEN_NO
+					const bool &do_save_bg = CC_SAVE_SCREEN_NO
 				);
 
 		enum
diff --git a/src/gui/components/cc_frm_header.cpp b/src/gui/components/cc_frm_header.cpp
index 6b866ac24..31bdf3fd8 100644
--- a/src/gui/components/cc_frm_header.cpp
+++ b/src/gui/components/cc_frm_header.cpp
@@ -707,7 +707,7 @@ void CComponentsHeader::initCCItems()
 	initLogo();
 }
 
-void CComponentsHeader::paint(bool do_save_bg)
+void CComponentsHeader::paint(const bool &do_save_bg)
 {
 	//prepare items
 	initCCItems();
diff --git a/src/gui/components/cc_frm_header.h b/src/gui/components/cc_frm_header.h
index 1d8ac71fa..678ddd4fc 100644
--- a/src/gui/components/cc_frm_header.h
+++ b/src/gui/components/cc_frm_header.h
@@ -328,7 +328,7 @@ class CComponentsHeader : public CComponentsForm, public CCTextScreen, CCHeaderT
 		void disableClock();
 
 		///paint header
-		void paint(bool do_save_bg = CC_SAVE_SCREEN_YES);
+		void paint(const bool &do_save_bg = CC_SAVE_SCREEN_YES);
 
 		///hides item, arg: no_restore see hideCCItem()
 		void hide(){disableClock(); CComponentsForm::hide();}
diff --git a/src/gui/components/cc_frm_signalbars.cpp b/src/gui/components/cc_frm_signalbars.cpp
index c9476d7bc..b007dcc67 100644
--- a/src/gui/components/cc_frm_signalbars.cpp
+++ b/src/gui/components/cc_frm_signalbars.cpp
@@ -233,7 +233,7 @@ void CSignalBar::paintScale()
 	}
 }
 
-void CSignalBar::paint(bool do_save_bg)
+void CSignalBar::paint(const bool &do_save_bg)
 {
 	//initialize before and paint frame and body
 	if (!is_painted){
@@ -353,7 +353,7 @@ void CSignalBox::paintScale()
 	snrbar->paint/*Scale*/(false);
 }
 
-void CSignalBox::paint(bool do_save_bg)
+void CSignalBox::paint(const bool &do_save_bg)
 {
 	//paint frame and body
 	if (!is_painted)
diff --git a/src/gui/components/cc_frm_signalbars.h b/src/gui/components/cc_frm_signalbars.h
index 3a4cde963..a33c0a352 100644
--- a/src/gui/components/cc_frm_signalbars.h
+++ b/src/gui/components/cc_frm_signalbars.h
@@ -146,7 +146,7 @@ class CSignalBar : public CComponentsForm, public CCTextScreen
 		virtual int getScaleWidth(){ return sb_scale_width;};
 
 		///paint this items
-		virtual void paint(bool do_save_bg);
+		virtual void paint(const bool &do_save_bg);
 
 		//returns the current signal value
 		uint16_t getValue(void) { return sb_signal; }
@@ -329,7 +329,7 @@ class CSignalBox : public CComponentsForm, public CCTextScreen
 		fb_pixel_t getPassiveColor(){return sbx_passive_color;};
 
 		///paint items
-		void paint(bool do_save_bg);
+		void paint(const bool &do_save_bg);
 
 		///return current signal value
 		uint16_t getSignalValue(void) { return sbar->getValue();}
diff --git a/src/gui/components/cc_frm_slider.cpp b/src/gui/components/cc_frm_slider.cpp
index 9c022cad3..8284f1dc8 100644
--- a/src/gui/components/cc_frm_slider.cpp
+++ b/src/gui/components/cc_frm_slider.cpp
@@ -157,7 +157,7 @@ void CComponentsSlider::setSliderIcon(const std::string &icon_name)
 	initCCSlSlider();
 }
 
-// void CComponentsSlider::paint(bool do_save_bg)
+// void CComponentsSlider::paint(const bool &do_save_bg)
 // {
 // 	//prepare items before paint
 // 	initCCSlItems();
diff --git a/src/gui/components/cc_frm_slider.h b/src/gui/components/cc_frm_slider.h
index afa7a13bf..1c0d4c624 100644
--- a/src/gui/components/cc_frm_slider.h
+++ b/src/gui/components/cc_frm_slider.h
@@ -76,7 +76,7 @@ class CComponentsSlider : public CComponentsForm
 		void setValueScale(const int& min_value, const int& max_value);
 		void setSliderIcon(const std::string &icon_name);
 
-// 		void paint(bool do_save_bg = CC_SAVE_SCREEN_YES);
+// 		void paint(const bool &do_save_bg = CC_SAVE_SCREEN_YES);
 };
 
 #endif
diff --git a/src/gui/components/cc_frm_window.cpp b/src/gui/components/cc_frm_window.cpp
index c60aab34d..ca1385136 100644
--- a/src/gui/components/cc_frm_window.cpp
+++ b/src/gui/components/cc_frm_window.cpp
@@ -432,7 +432,7 @@ void CComponentsWindow::enablePageScroll(const int& mode)
 	ccw_body->enablePageScroll(mode);
 }
 
-void CComponentsWindow::paintCurPage(bool do_save_bg)
+void CComponentsWindow::paintCurPage(const bool &do_save_bg)
 {
 	if (is_painted) //ensure that we have painted already the parent form before paint body 
 		ccw_body->paint(do_save_bg);
@@ -440,13 +440,13 @@ void CComponentsWindow::paintCurPage(bool do_save_bg)
 		paint(do_save_bg);
 }
 
-void CComponentsWindow::paintPage(const uint8_t& page_number, bool do_save_bg)
+void CComponentsWindow::paintPage(const uint8_t& page_number, const bool &do_save_bg)
 {
 	CComponentsWindow::setCurrentPage(page_number);
 	CComponentsWindow::paintCurPage(do_save_bg);
 }
 
-void CComponentsWindow::paint(bool do_save_bg)
+void CComponentsWindow::paint(const bool &do_save_bg)
 {
 	//prepare items before paint
 	initCCWItems();
diff --git a/src/gui/components/cc_frm_window.h b/src/gui/components/cc_frm_window.h
index e3cb65ebc..199ff5759 100644
--- a/src/gui/components/cc_frm_window.h
+++ b/src/gui/components/cc_frm_window.h
@@ -385,7 +385,7 @@ class CComponentsWindow : public CComponentsForm, CCHeaderTypes
 		* @param[in]	do_save_bg
 		* 	@li 	optional: expects type bool, default = CC_SAVE_SCREEN_NO (false), sets background save mode
 		*/
-		void paintCurPage(bool do_save_bg = CC_SAVE_SCREEN_NO);
+		void paintCurPage(const bool &do_save_bg = CC_SAVE_SCREEN_NO);
 
 		/**
 		* Paints defined page of body, parameter number 0...n
@@ -394,7 +394,7 @@ class CComponentsWindow : public CComponentsForm, CCHeaderTypes
 		* @param[in]	do_save_bg
 		* 	@li 	optional: expects type bool, default = CC_SAVE_SCREEN_NO (false), sets background save mode
 		*/
-		void paintPage(const uint8_t& page_number, bool do_save_bg = CC_SAVE_SCREEN_NO);
+		void paintPage(const uint8_t& page_number, const bool &do_save_bg = CC_SAVE_SCREEN_NO);
 
 		/**
 		* enable/disable page scroll
@@ -420,7 +420,7 @@ class CComponentsWindow : public CComponentsForm, CCHeaderTypes
 		* @param[in]	do_save_bg
 		* 	@li 	optional: expects type bool, sets background save mode
 		*/
-		void paint(bool do_save_bg = CC_SAVE_SCREEN_YES);
+		void paint(const bool &do_save_bg = CC_SAVE_SCREEN_YES);
 
 		/**
 		* Adds an additional exec key to current collection, default exit keys are CRCInput::RC_home and CRCInput::RC_setup
diff --git a/src/gui/components/cc_item.cpp b/src/gui/components/cc_item.cpp
index 0bbf45e60..7d9261348 100644
--- a/src/gui/components/cc_item.cpp
+++ b/src/gui/components/cc_item.cpp
@@ -65,7 +65,7 @@ void CComponentsItem::initParent(CComponentsForm* parent)
 // init container properties in cc-items for shadow, background and frame.
 // This member must be called first in all paint() members before paint other items into the container.
 // If backround is not required, it's possible to override this with variable paint_bg=false, use doPaintBg(true/false) to set this!
-void CComponentsItem::paintInit(bool do_save_bg)
+void CComponentsItem::paintInit(const bool &do_save_bg)
 {
 	if (hasChanges()){
 		clearFbData();
diff --git a/src/gui/components/cc_item.h b/src/gui/components/cc_item.h
index 08b4336ac..6c357001a 100644
--- a/src/gui/components/cc_item.h
+++ b/src/gui/components/cc_item.h
@@ -59,7 +59,7 @@ class CComponentsItem : public CComponents
 		///If backround is not required, it's possible to override this with variable paint_bg=false, use doPaintBg(true/false) to set this!
 		///arg do_save_bg=false avoids using of unnecessary pixel memory, eg. if no hide with restore is provided. This is mostly the case  whenever
 		///an item will be hide or overpainted with other methods, or it's embedded  (bound)  in a parent form.
-		void paintInit(bool do_save_bg);
+		void paintInit(const bool &do_save_bg);
 
 		///add "this" current item to parent
 		void initParent(CComponentsForm* parent);
diff --git a/src/gui/components/cc_item_infobox.cpp b/src/gui/components/cc_item_infobox.cpp
index f1df156d1..83101c483 100644
--- a/src/gui/components/cc_item_infobox.cpp
+++ b/src/gui/components/cc_item_infobox.cpp
@@ -138,7 +138,7 @@ void CComponentsInfoBox::paintPicture()
 	pic->paint(CC_SAVE_SCREEN_NO);	
 }
 
-void CComponentsInfoBox::paint(bool do_save_bg)
+void CComponentsInfoBox::paint(const bool &do_save_bg)
 {
 	paintInit(do_save_bg);
 	paintPicture();
diff --git a/src/gui/components/cc_item_infobox.h b/src/gui/components/cc_item_infobox.h
index afad2989d..7733615a5 100644
--- a/src/gui/components/cc_item_infobox.h
+++ b/src/gui/components/cc_item_infobox.h
@@ -88,7 +88,7 @@ class CComponentsInfoBox : public CComponentsText
 		///retur internal picture object
 		CComponentsPicture * getPictureObject(){return pic;}
 		///paint item
-		void paint(bool do_save_bg = CC_SAVE_SCREEN_YES);
+		void paint(const bool &do_save_bg = CC_SAVE_SCREEN_YES);
 };
 
 #endif
diff --git a/src/gui/components/cc_item_picture.cpp b/src/gui/components/cc_item_picture.cpp
index 6576e1756..a612ca22e 100644
--- a/src/gui/components/cc_item_picture.cpp
+++ b/src/gui/components/cc_item_picture.cpp
@@ -343,7 +343,7 @@ void CComponentsPicture::paintPicture()
 	}
 }
 
-void CComponentsPicture::paint(bool do_save_bg)
+void CComponentsPicture::paint(const bool &do_save_bg)
 {
 	if (pic_name.empty())
 		return;
diff --git a/src/gui/components/cc_item_picture.h b/src/gui/components/cc_item_picture.h
index a29c056f2..f6c12bcd7 100644
--- a/src/gui/components/cc_item_picture.h
+++ b/src/gui/components/cc_item_picture.h
@@ -179,7 +179,7 @@ class CComponentsPicture : public CComponentsItem
 		void SetTransparent(int t){ image_transparent = t; }
 
 		///paint item
-		void paint(bool do_save_bg = CC_SAVE_SCREEN_YES);
+		void paint(const bool &do_save_bg = CC_SAVE_SCREEN_YES);
 		///hide item, see also CComponents::hide();
 		void hide();
 
diff --git a/src/gui/components/cc_item_progressbar.cpp b/src/gui/components/cc_item_progressbar.cpp
index 5b94608ed..02c574666 100644
--- a/src/gui/components/cc_item_progressbar.cpp
+++ b/src/gui/components/cc_item_progressbar.cpp
@@ -371,7 +371,7 @@ void CProgressBarCache::pbcApplyGradient(fb_pixel_t *b)
 	}
 }
 
-void CProgressBar::paintProgress(bool do_save_bg)
+void CProgressBar::paintProgress(const bool &do_save_bg)
 {
 	if (*pb_design == PB_OFF) {
 		paintInit(false);
@@ -416,7 +416,7 @@ void CProgressBar::paintProgress(bool do_save_bg)
 }
 
 
-void CProgressBar::paint(bool do_save_bg)
+void CProgressBar::paint(const bool &do_save_bg)
 {
   	paintProgress(do_save_bg);
 }
diff --git a/src/gui/components/cc_item_progressbar.h b/src/gui/components/cc_item_progressbar.h
index dbc5644cd..f5ea152d4 100644
--- a/src/gui/components/cc_item_progressbar.h
+++ b/src/gui/components/cc_item_progressbar.h
@@ -150,7 +150,7 @@ class CProgressBar : public CComponentsItem
 		void initDimensions();
 
 		///paints graph
-		void paintProgress(bool do_save_bg = CC_SAVE_SCREEN_NO);
+		void paintProgress(const bool &do_save_bg = CC_SAVE_SCREEN_NO);
 
 	public:
 		///parameters:
@@ -198,7 +198,7 @@ class CProgressBar : public CComponentsItem
 
 		///force update on next paint
 		void reset() { pb_last_width = -1; }
-		void paint(bool do_save_bg = CC_SAVE_SCREEN_NO);
+		void paint(const bool &do_save_bg = CC_SAVE_SCREEN_NO);
 
 		enum pb_color_t {
 			PB_OFF = -2,	/* -2 */
diff --git a/src/gui/components/cc_item_shapes.cpp b/src/gui/components/cc_item_shapes.cpp
index dccd1b5a4..e9f412453 100644
--- a/src/gui/components/cc_item_shapes.cpp
+++ b/src/gui/components/cc_item_shapes.cpp
@@ -56,7 +56,7 @@ CComponentsShapeSquare::CComponentsShapeSquare(	const int x_pos, const int y_pos
 	initParent(parent);
 }
 
-void CComponentsShapeSquare::paint(bool do_save_bg)
+void CComponentsShapeSquare::paint(const bool &do_save_bg)
 {
 	paintInit(do_save_bg);
 }
@@ -105,7 +105,7 @@ CComponentsShapeCircle::CComponentsShapeCircle(	int x_pos, int y_pos, int diam,
 //
 // 	 +	 -	 +
 
-void CComponentsShapeCircle::paint(bool do_save_bg)
+void CComponentsShapeCircle::paint(const bool &do_save_bg)
 {
 	paintInit(do_save_bg);
 }
diff --git a/src/gui/components/cc_item_shapes.h b/src/gui/components/cc_item_shapes.h
index 0f926c011..677ef8dfd 100644
--- a/src/gui/components/cc_item_shapes.h
+++ b/src/gui/components/cc_item_shapes.h
@@ -57,7 +57,7 @@ class CComponentsShapeCircle : public CComponentsItem
 		inline int getDiam() const {return d;};
 
 		///paint item
-		void paint(bool do_save_bg = CC_SAVE_SCREEN_YES);
+		void paint(const bool &do_save_bg = CC_SAVE_SCREEN_YES);
 };
 
 class CComponentsShapeSquare : public CComponentsItem
@@ -70,7 +70,7 @@ class CComponentsShapeSquare : public CComponentsItem
 					fb_pixel_t color_body = COL_MENUCONTENT_PLUS_0,
 					fb_pixel_t color_shadow = COL_SHADOW_PLUS_0);
 
-		void paint(bool do_save_bg = CC_SAVE_SCREEN_YES);
+		void paint(const bool &do_save_bg = CC_SAVE_SCREEN_YES);
 };
 
 
diff --git a/src/gui/components/cc_item_text.cpp b/src/gui/components/cc_item_text.cpp
index 3d57ae8c7..447984fc7 100644
--- a/src/gui/components/cc_item_text.cpp
+++ b/src/gui/components/cc_item_text.cpp
@@ -278,7 +278,7 @@ bool CComponentsText::setTextFromFile(const string& path_to_textfile, const int
 	return setText(txt, mode, font_text, color_text, style);
 }
 
-void CComponentsText::paintText(bool do_save_bg)
+void CComponentsText::paintText(const bool &do_save_bg)
 {
 	if (cc_parent){
 		if(!cc_parent->OnAfterPaintBg.empty())
@@ -300,7 +300,7 @@ void CComponentsText::paintText(bool do_save_bg)
 	ct_text_sent = false;
 }
 
-void CComponentsText::paint(bool do_save_bg)
+void CComponentsText::paint(const bool &do_save_bg)
 {
 	OnBeforePaint();
 	paintText(do_save_bg);
diff --git a/src/gui/components/cc_item_text.h b/src/gui/components/cc_item_text.h
index e017edd7e..97f8798f5 100644
--- a/src/gui/components/cc_item_text.h
+++ b/src/gui/components/cc_item_text.h
@@ -96,7 +96,7 @@ class CComponentsText : public CCTextScreen, public CComponentsItem
 		void initCBox();
 
 		///paint CCItem backckrond (if paint_bg=true), apply initCCText() and send paint() to the CTextBox object
-		void paintText(bool do_save_bg = CC_SAVE_SCREEN_YES);
+		void paintText(const bool &do_save_bg = CC_SAVE_SCREEN_YES);
 	public:
 		enum {
 			FONT_STYLE_REGULAR	= 0,
@@ -136,7 +136,7 @@ class CComponentsText : public CCTextScreen, public CComponentsItem
 		///remove textbox from screen
 		void kill(const fb_pixel_t& bg_color = COL_BACKGROUND_PLUS_0, const int& corner_radius = -1, const int& fblayer_type = CC_FBDATA_TYPES);
 		///paint text box, parameter do_save_bg: default = true, causes fill of backckrond pixel buffer
-		void paint(bool do_save_bg = CC_SAVE_SCREEN_YES);
+		void paint(const bool &do_save_bg = CC_SAVE_SCREEN_YES);
 
 		///send options for text font (size and type), color and mode (allignment)
 		 void setTextFont(Font* font_text);
diff --git a/src/gui/components/cc_item_tvpic.cpp b/src/gui/components/cc_item_tvpic.cpp
index d6787861c..4397b09f9 100644
--- a/src/gui/components/cc_item_tvpic.cpp
+++ b/src/gui/components/cc_item_tvpic.cpp
@@ -77,7 +77,7 @@ CComponentsPIP::~CComponentsPIP()
 //  	videoDecoder->Pig(-1, -1, -1, -1);
 }
 
-void CComponentsPIP::paint(bool do_save_bg)
+void CComponentsPIP::paint(const bool &do_save_bg)
 {
 	//NOTE: real values are reqiured, if we paint not bound items or an own render methodes
 	int pig_x = (cc_parent ? cc_xr : x) + fr_thickness;
diff --git a/src/gui/components/cc_item_tvpic.h b/src/gui/components/cc_item_tvpic.h
index 373a88490..7ab2bb3fd 100644
--- a/src/gui/components/cc_item_tvpic.h
+++ b/src/gui/components/cc_item_tvpic.h
@@ -65,7 +65,7 @@ class CComponentsPIP : public CComponentsItem
 		void setPicture(const std::string& image){pic_name = image;};
 
 		///show tv box
-		void paint(bool do_save_bg = CC_SAVE_SCREEN_YES);
+		void paint(const bool &do_save_bg = CC_SAVE_SCREEN_YES);
 		///remove tv box from screen
 		void hide();
 };
diff --git a/src/gui/volumebar.cpp b/src/gui/volumebar.cpp
index 1f057b6e0..c19ac7919 100644
--- a/src/gui/volumebar.cpp
+++ b/src/gui/volumebar.cpp
@@ -247,7 +247,7 @@ void CVolumeBar::paintVolScale()
 	vb_pb->paint(CC_SAVE_SCREEN_NO);
 }
 
-void CVolumeBar::paint(bool do_save_bg)
+void CVolumeBar::paint(const bool &do_save_bg)
 {
 	//prepare items
 	initVolumeBarItems();
diff --git a/src/gui/volumebar.h b/src/gui/volumebar.h
index cfc201305..e95ffc540 100644
--- a/src/gui/volumebar.h
+++ b/src/gui/volumebar.h
@@ -89,7 +89,7 @@ class CVolumeBar : public CComponentsForm
 // 		~CVolumeBar(); inherited from CComponentsForm
 
 		void repaintVolScale();
-		void paint(bool do_save_bg = CC_SAVE_SCREEN_YES);
+		void paint(const bool &do_save_bg = CC_SAVE_SCREEN_YES);
 };
 
 
diff --git a/src/gui/widget/helpbox.h b/src/gui/widget/helpbox.h
index 238a79c1b..4165e79c8 100644
--- a/src/gui/widget/helpbox.h
+++ b/src/gui/widget/helpbox.h
@@ -74,7 +74,7 @@ public:
 			const char* Icon = NEUTRINO_ICON_INFO);
 
 	///show = paint, for compatibility
-	void show(bool do_save_bg = true){ paint(do_save_bg) ;}
+	void show(const bool &do_save_bg = true){ paint(do_save_bg) ;}
 
 
 	/**Adds an item with pre defined text
diff --git a/src/gui/widget/navibar.cpp b/src/gui/widget/navibar.cpp
index 925b2f449..a8b8b3833 100644
--- a/src/gui/widget/navibar.cpp
+++ b/src/gui/widget/navibar.cpp
@@ -115,7 +115,7 @@ void CNaviBar::initCCItems()
 }
 
 
-void CNaviBar::paint(bool do_save_bg)
+void CNaviBar::paint(const bool &do_save_bg)
 {
 	hideCCItems();
 	nb_lText->hide();
diff --git a/src/gui/widget/navibar.h b/src/gui/widget/navibar.h
index 48740ec04..21d6759d5 100644
--- a/src/gui/widget/navibar.h
+++ b/src/gui/widget/navibar.h
@@ -162,7 +162,7 @@ class CNaviBar : public CComponentsFrmChain
 		* @param[in]	do_save_bg
 		* 	@li 	optional: expects type bool, default = CC_SAVE_SCREEN_YES.
 		*/
-		void paint(bool do_save_bg = CC_SAVE_SCREEN_YES);
+		void paint(const bool &do_save_bg = CC_SAVE_SCREEN_YES);
 };
 
 #endif
diff --git a/src/gui/widget/progresswindow.cpp b/src/gui/widget/progresswindow.cpp
index 50626c232..19fd6568a 100644
--- a/src/gui/widget/progresswindow.cpp
+++ b/src/gui/widget/progresswindow.cpp
@@ -211,7 +211,7 @@ int CProgressWindow::exec(CMenuTarget* parent, const string & /*actionKey*/)
 	return menu_return::RETURN_REPAINT;
 }
 
-void CProgressWindow::paint(bool do_save_bg)
+void CProgressWindow::paint(const bool &do_save_bg)
 {
 	fitItems();
 	CComponentsWindow::paint(do_save_bg);
diff --git a/src/gui/widget/progresswindow.h b/src/gui/widget/progresswindow.h
index da88911f3..fed2bd940 100644
--- a/src/gui/widget/progresswindow.h
+++ b/src/gui/widget/progresswindow.h
@@ -285,7 +285,7 @@ class CProgressWindow : public CComponentsWindow, public CMenuTarget
 		* @param[in]	do_save_bg
 		* 	@li 	optional: expects type bool, sets background save mode
 		*/
-		void paint(bool do_save_bg = true);
+		void paint(const bool &do_save_bg = true);
 };
 
 class CProgressSignals : public sigc::trackable