diff --git a/src/gui/widgets/container_base.cpp b/src/gui/widgets/container_base.cpp
index 5d9c67d77a2..5f15828e088 100644
--- a/src/gui/widgets/container_base.cpp
+++ b/src/gui/widgets/container_base.cpp
@@ -221,13 +221,13 @@ const widget* container_base::find_at(const point& coordinate,
 	return grid_.find_at(coordinate, must_be_active);
 }
 
-widget* container_base::find(const std::string& id, const bool must_be_active)
+widget* container_base::find(const std::string_view id, const bool must_be_active)
 {
 	widget* result = styled_widget::find(id, must_be_active);
 	return result ? result : grid_.find(id, must_be_active);
 }
 
-const widget* container_base::find(const std::string& id,
+const widget* container_base::find(const std::string_view id,
 								 const bool must_be_active) const
 {
 	const widget* result = styled_widget::find(id, must_be_active);
diff --git a/src/gui/widgets/container_base.hpp b/src/gui/widgets/container_base.hpp
index 35963555a68..a0937e29bfe 100644
--- a/src/gui/widgets/container_base.hpp
+++ b/src/gui/widgets/container_base.hpp
@@ -119,11 +119,10 @@ public:
 								   const bool must_be_active) const override;
 
 	/** See @ref widget::find. */
-	widget* find(const std::string& id, const bool must_be_active) override;
+	widget* find(const std::string_view id, const bool must_be_active) override;
 
 	/** See @ref widget::find. */
-	const widget* find(const std::string& id,
-						const bool must_be_active) const override;
+	const widget* find(const std::string_view id, const bool must_be_active) const override;
 
 	/** See @ref styled_widget::set_active. */
 	virtual void set_active(const bool active) override;
diff --git a/src/gui/widgets/generator.cpp b/src/gui/widgets/generator.cpp
index b34dc2aa7c5..d51eef63720 100644
--- a/src/gui/widgets/generator.cpp
+++ b/src/gui/widgets/generator.cpp
@@ -976,7 +976,7 @@ const widget* independent::find_at(const point& coordinate, const bool must_be_a
 	return grid.find_at(coordinate, must_be_active);
 }
 
-widget* independent::find(const std::string& id, const bool must_be_active)
+widget* independent::find(const std::string_view id, const bool must_be_active)
 {
 	for(std::size_t i = 0; i < get_item_count(); ++i) {
 		if(is_selected(i)) {
@@ -989,7 +989,7 @@ widget* independent::find(const std::string& id, const bool must_be_active)
 	return nullptr;
 }
 
-const widget* independent::find(const std::string& id, const bool must_be_active) const
+const widget* independent::find(const std::string_view id, const bool must_be_active) const
 {
 	for(std::size_t i = 0; i < get_item_count(); ++i) {
 		if(is_selected(i)) {
diff --git a/src/gui/widgets/generator_private.hpp b/src/gui/widgets/generator_private.hpp
index 9802c5189c3..884a32f5687 100644
--- a/src/gui/widgets/generator_private.hpp
+++ b/src/gui/widgets/generator_private.hpp
@@ -455,10 +455,10 @@ struct independent : public virtual generator_base
 	virtual const widget* find_at(const point& coordinate, const bool must_be_active) const override;
 
 	/** See @ref widget::find. */
-	widget* find(const std::string& id, const bool must_be_active) override;
+	widget* find(const std::string_view id, const bool must_be_active) override;
 
 	/** See @ref widget::find. */
-	const widget* find(const std::string& id, const bool must_be_active) const override;
+	const widget* find(const std::string_view id, const bool must_be_active) const override;
 
 	/***** ***** ***** ***** keyboard functions ***** ***** ***** *****/
 
diff --git a/src/gui/widgets/grid.cpp b/src/gui/widgets/grid.cpp
index 5004a26b094..e345f5f06fa 100644
--- a/src/gui/widgets/grid.cpp
+++ b/src/gui/widgets/grid.cpp
@@ -642,13 +642,12 @@ const widget* grid::find_at(const point& coordinate,
 			*this, coordinate, must_be_active);
 }
 
-widget* grid::find(const std::string& id, const bool must_be_active)
+widget* grid::find(const std::string_view id, const bool must_be_active)
 {
 	return grid_implementation::find<widget>(*this, id, must_be_active);
 }
 
-const widget* grid::find(const std::string& id, const bool must_be_active)
-		const
+const widget* grid::find(const std::string_view id, const bool must_be_active) const
 {
 	return grid_implementation::find<const widget>(*this, id, must_be_active);
 }
diff --git a/src/gui/widgets/grid.hpp b/src/gui/widgets/grid.hpp
index 3cee8999ec4..8dac2275042 100644
--- a/src/gui/widgets/grid.hpp
+++ b/src/gui/widgets/grid.hpp
@@ -282,11 +282,10 @@ public:
 								   const bool must_be_active) const override;
 
 	/** See @ref widget::find. */
-	widget* find(const std::string& id, const bool must_be_active) override;
+	widget* find(const std::string_view id, const bool must_be_active) override;
 
 	/** See @ref widget::find. */
-	const widget* find(const std::string& id,
-						const bool must_be_active) const override;
+	const widget* find(const std::string_view id, const bool must_be_active) const override;
 
 	/** See @ref widget::has_widget. */
 	virtual bool has_widget(const widget& widget) const override;
diff --git a/src/gui/widgets/grid_private.hpp b/src/gui/widgets/grid_private.hpp
index ad6427714e8..e8caa533a7b 100644
--- a/src/gui/widgets/grid_private.hpp
+++ b/src/gui/widgets/grid_private.hpp
@@ -83,7 +83,7 @@ struct grid_implementation
 	 */
 	template <class W>
 	static W* find(utils::const_clone_ref<grid, W> grid,
-				   const std::string& id,
+				   const std::string_view id,
 				   const bool must_be_active)
 	{
 		// Inherited.
diff --git a/src/gui/widgets/matrix.cpp b/src/gui/widgets/matrix.cpp
index dbc5a12c1af..a299d3f2e19 100644
--- a/src/gui/widgets/matrix.cpp
+++ b/src/gui/widgets/matrix.cpp
@@ -131,7 +131,7 @@ const widget* matrix::find_at(const point& coordinate,
 	return content_.find_at(coordinate, must_be_active);
 }
 
-widget* matrix::find(const std::string& id, const bool must_be_active)
+widget* matrix::find(const std::string_view id, const bool must_be_active)
 {
 	if(widget* result = widget::find(id, must_be_active)) {
 		return result;
@@ -140,7 +140,7 @@ widget* matrix::find(const std::string& id, const bool must_be_active)
 	}
 }
 
-const widget* matrix::find(const std::string& id, const bool must_be_active)
+const widget* matrix::find(const std::string_view id, const bool must_be_active)
 		const
 {
 	if(const widget* result = widget::find(id, must_be_active)) {
diff --git a/src/gui/widgets/matrix.hpp b/src/gui/widgets/matrix.hpp
index 226bf036cc0..f4fdd67c31a 100644
--- a/src/gui/widgets/matrix.hpp
+++ b/src/gui/widgets/matrix.hpp
@@ -134,11 +134,10 @@ public:
 								   const bool must_be_active) const override;
 
 	/** See @ref widget::find. */
-	widget* find(const std::string& id, const bool must_be_active) override;
+	widget* find(const std::string_view id, const bool must_be_active) override;
 
 	/** See @ref widget::find. */
-	const widget* find(const std::string& id,
-						const bool must_be_active) const override;
+	const widget* find(const std::string_view id, const bool must_be_active) const override;
 
 	/***** ***** ***** ***** Forwarded to pane_. ***** ***** ****** *****/
 	/**
diff --git a/src/gui/widgets/scrollbar_container.cpp b/src/gui/widgets/scrollbar_container.cpp
index 8c16f8e1b82..31c3d7cae83 100644
--- a/src/gui/widgets/scrollbar_container.cpp
+++ b/src/gui/widgets/scrollbar_container.cpp
@@ -500,12 +500,12 @@ const widget* scrollbar_container::find_at(const point& coordinate, const bool m
 	return w;
 }
 
-widget* scrollbar_container::find(const std::string& id, const bool must_be_active)
+widget* scrollbar_container::find(const std::string_view id, const bool must_be_active)
 {
 	return scrollbar_container_implementation::find<widget>(*this, id, must_be_active);
 }
 
-const widget* scrollbar_container::find(const std::string& id, const bool must_be_active) const
+const widget* scrollbar_container::find(const std::string_view id, const bool must_be_active) const
 {
 	return scrollbar_container_implementation::find<const widget>(*this, id, must_be_active);
 }
diff --git a/src/gui/widgets/scrollbar_container.hpp b/src/gui/widgets/scrollbar_container.hpp
index 0975663ff3c..99748bdbede 100644
--- a/src/gui/widgets/scrollbar_container.hpp
+++ b/src/gui/widgets/scrollbar_container.hpp
@@ -130,10 +130,10 @@ public:
 	virtual const widget* find_at(const point& coordinate, const bool must_be_active) const override;
 
 	/** See @ref widget::find. */
-	widget* find(const std::string& id, const bool must_be_active) override;
+	widget* find(const std::string_view id, const bool must_be_active) override;
 
 	/** See @ref widget::find. */
-	const widget* find(const std::string& id, const bool must_be_active) const override;
+	const widget* find(const std::string_view id, const bool must_be_active) const override;
 
 	/** See @ref widget::disable_click_dismiss. */
 	bool disable_click_dismiss() const override;
diff --git a/src/gui/widgets/scrollbar_container_private.hpp b/src/gui/widgets/scrollbar_container_private.hpp
index 0cf2659b7e5..2629b58b6d1 100644
--- a/src/gui/widgets/scrollbar_container_private.hpp
+++ b/src/gui/widgets/scrollbar_container_private.hpp
@@ -85,7 +85,7 @@ struct scrollbar_container_implementation
 	static W*
 	find(utils::const_clone_ref<scrollbar_container, W>
 				 scrollbar_container,
-		 const std::string& id,
+		 const std::string_view id,
 		 const bool must_be_active)
 	{
 		// Inherited.
diff --git a/src/gui/widgets/stacked_widget.cpp b/src/gui/widgets/stacked_widget.cpp
index ed3fc81d7d9..95f8ec12b7f 100644
--- a/src/gui/widgets/stacked_widget.cpp
+++ b/src/gui/widgets/stacked_widget.cpp
@@ -40,7 +40,7 @@ struct stacked_widget_implementation
 {
 	template<typename W>
 	static W* find(utils::const_clone_ref<stacked_widget, W> stack,
-			const std::string& id,
+			const std::string_view id,
 			const bool must_be_active)
 	{
 		// Use base method if find-in-all-layer isn't set.
@@ -193,12 +193,12 @@ const grid* stacked_widget::get_layer_grid(unsigned int i) const
 	return &generator_->item(i);
 }
 
-widget* stacked_widget::find(const std::string& id, const bool must_be_active)
+widget* stacked_widget::find(const std::string_view id, const bool must_be_active)
 {
 	return stacked_widget_implementation::find<widget>(*this, id, must_be_active);
 }
 
-const widget* stacked_widget::find(const std::string& id, const bool must_be_active) const
+const widget* stacked_widget::find(const std::string_view id, const bool must_be_active) const
 {
 	return stacked_widget_implementation::find<const widget>(*this, id, must_be_active);
 }
diff --git a/src/gui/widgets/stacked_widget.hpp b/src/gui/widgets/stacked_widget.hpp
index a52a293f48b..2c2ffbe1fc7 100644
--- a/src/gui/widgets/stacked_widget.hpp
+++ b/src/gui/widgets/stacked_widget.hpp
@@ -174,10 +174,10 @@ private:
 
 public:
 	/** See @ref widget::find. */
-	virtual widget* find(const std::string& id, const bool must_be_active) override;
+	virtual widget* find(const std::string_view id, const bool must_be_active) override;
 
 	/** See @ref widget::find. */
-	virtual const widget* find(const std::string& id, const bool must_be_active) const override;
+	virtual const widget* find(const std::string_view id, const bool must_be_active) const override;
 };
 
 // }---------- DEFINITION ---------{
diff --git a/src/gui/widgets/styled_widget.cpp b/src/gui/widgets/styled_widget.cpp
index aaab4cf727f..8cf8dd95fad 100644
--- a/src/gui/widgets/styled_widget.cpp
+++ b/src/gui/widgets/styled_widget.cpp
@@ -301,7 +301,7 @@ const widget* styled_widget::find_at(const point& coordinate,
 				   : nullptr;
 }
 
-widget* styled_widget::find(const std::string& id, const bool must_be_active)
+widget* styled_widget::find(const std::string_view id, const bool must_be_active)
 {
 	return (widget::find(id, must_be_active)
 			&& (!must_be_active || get_active()))
@@ -309,7 +309,7 @@ widget* styled_widget::find(const std::string& id, const bool must_be_active)
 				   : nullptr;
 }
 
-const widget* styled_widget::find(const std::string& id, const bool must_be_active)
+const widget* styled_widget::find(const std::string_view id, const bool must_be_active)
 		const
 {
 	return (widget::find(id, must_be_active)
diff --git a/src/gui/widgets/styled_widget.hpp b/src/gui/widgets/styled_widget.hpp
index 7d7f11669f3..e7b335d2029 100644
--- a/src/gui/widgets/styled_widget.hpp
+++ b/src/gui/widgets/styled_widget.hpp
@@ -192,11 +192,10 @@ public:
 								   const bool must_be_active) const override;
 
 	/** See @ref widget::find. */
-	widget* find(const std::string& id, const bool must_be_active) override;
+	widget* find(const std::string_view id, const bool must_be_active) override;
 
 	/** See @ref widget::find. */
-	const widget* find(const std::string& id,
-						const bool must_be_active) const override;
+	const widget* find(const std::string_view id, const bool must_be_active) const override;
 
 	/***** ***** ***** setters / getters for members ***** ****** *****/
 	bool get_use_tooltip_on_label_overflow() const
diff --git a/src/gui/widgets/tree_view_node.cpp b/src/gui/widgets/tree_view_node.cpp
index c3ad49d5b92..5be436ee347 100644
--- a/src/gui/widgets/tree_view_node.cpp
+++ b/src/gui/widgets/tree_view_node.cpp
@@ -424,7 +424,7 @@ const widget* tree_view_node::find_at(const point& coordinate, const bool must_b
 	return tree_view_node_implementation::find_at<const widget>(*this, coordinate, must_be_active);
 }
 
-widget* tree_view_node::find(const std::string& id, const bool must_be_active)
+widget* tree_view_node::find(const std::string_view id, const bool must_be_active)
 {
 	widget* result = widget::find(id, must_be_active);
 	if(result) {
@@ -446,7 +446,7 @@ widget* tree_view_node::find(const std::string& id, const bool must_be_active)
 	return nullptr;
 }
 
-const widget* tree_view_node::find(const std::string& id, const bool must_be_active) const
+const widget* tree_view_node::find(const std::string_view id, const bool must_be_active) const
 {
 	const widget* result = widget::find(id, must_be_active);
 	if(result) {
diff --git a/src/gui/widgets/tree_view_node.hpp b/src/gui/widgets/tree_view_node.hpp
index c206626f4ab..716e0dfac2b 100644
--- a/src/gui/widgets/tree_view_node.hpp
+++ b/src/gui/widgets/tree_view_node.hpp
@@ -191,11 +191,10 @@ public:
 								   const bool must_be_active) const override;
 
 	/** See @ref widget::find. */
-	widget* find(const std::string& id, const bool must_be_active) override;
+	widget* find(const std::string_view id, const bool must_be_active) override;
 
 	/** See @ref widget::find. */
-	const widget* find(const std::string& id,
-						const bool must_be_active) const override;
+	const widget* find(const std::string_view id, const bool must_be_active) const override;
 
 	/**
 	 * The number of children in this widget.
diff --git a/src/gui/widgets/viewport.cpp b/src/gui/widgets/viewport.cpp
index d0c7105de3c..9a34f4a2809 100644
--- a/src/gui/widgets/viewport.cpp
+++ b/src/gui/widgets/viewport.cpp
@@ -69,7 +69,7 @@ struct viewport_implementation
 
 	template <class W>
 	static utils::const_clone_ptr<widget, W>
-	find(W viewport, const std::string& id, const bool must_be_active)
+	find(W viewport, const std::string_view id, const bool must_be_active)
 	{
 		if(viewport->widget::find(id, must_be_active)) {
 			return viewport;
@@ -131,13 +131,12 @@ const widget* viewport::find_at(const point& coordinate,
 	return viewport_implementation::find_at(this, coordinate, must_be_active);
 }
 
-widget* viewport::find(const std::string& id, const bool must_be_active)
+widget* viewport::find(const std::string_view id, const bool must_be_active)
 {
 	return viewport_implementation::find(this, id, must_be_active);
 }
 
-const widget* viewport::find(const std::string& id, const bool must_be_active)
-		const
+const widget* viewport::find(const std::string_view id, const bool must_be_active) const
 {
 	return viewport_implementation::find(this, id, must_be_active);
 }
diff --git a/src/gui/widgets/viewport.hpp b/src/gui/widgets/viewport.hpp
index 58a311d7690..94a7490e3bf 100644
--- a/src/gui/widgets/viewport.hpp
+++ b/src/gui/widgets/viewport.hpp
@@ -59,11 +59,10 @@ public:
 								   const bool must_be_active) const override;
 
 	/** See @ref widget::find. */
-	widget* find(const std::string& id, const bool must_be_active) override;
+	widget* find(const std::string_view id, const bool must_be_active) override;
 
 	/** See @ref widget::find. */
-	const widget* find(const std::string& id,
-						const bool must_be_active) const override;
+	const widget* find(const std::string_view id, const bool must_be_active) const override;
 
 private:
 	/** See @ref widget::calculate_best_size. */
diff --git a/src/gui/widgets/widget.cpp b/src/gui/widgets/widget.cpp
index 06930e98a8d..74df607c25d 100644
--- a/src/gui/widgets/widget.cpp
+++ b/src/gui/widgets/widget.cpp
@@ -557,13 +557,12 @@ const widget* widget::find_at(const point& coordinate,
 	return is_at(coordinate, must_be_active) ? this : nullptr;
 }
 
-widget* widget::find(const std::string& id, const bool /*must_be_active*/)
+widget* widget::find(const std::string_view id, const bool /*must_be_active*/)
 {
 	return id_ == id ? this : nullptr;
 }
 
-const widget* widget::find(const std::string& id,
-							 const bool /*must_be_active*/) const
+const widget* widget::find(const std::string_view id, const bool /*must_be_active*/) const
 {
 	return id_ == id ? this : nullptr;
 }
diff --git a/src/gui/widgets/widget.hpp b/src/gui/widgets/widget.hpp
index 685fe338b9e..a4bc430a86f 100644
--- a/src/gui/widgets/widget.hpp
+++ b/src/gui/widgets/widget.hpp
@@ -702,11 +702,10 @@ public:
 	 * @retval nullptr               No widget with the id found (or not active if
 	 *                            must_be_active was set).
 	 */
-	virtual widget* find(const std::string& id, const bool must_be_active);
+	virtual widget* find(const std::string_view id, const bool must_be_active);
 
 	/** The constant version of @ref find. */
-	virtual const widget* find(const std::string& id,
-								const bool must_be_active) const;
+	virtual const widget* find(const std::string_view id, const bool must_be_active) const;
 
 	/**
 	 * Does the widget contain the widget.
@@ -739,25 +738,25 @@ public:
 	 * @returns                   The widget with the id.
 	 */
 	template <class T>
-	NOT_DANGLING T* find_widget(
-		const std::string& id,
+	T* find_widget(
+		const std::string_view id,
 		const bool must_be_active,
 		const bool must_exist)
 	{
 		T* result = dynamic_cast<T*>(this->find(id, must_be_active));
-		VALIDATE(!must_exist || result, missing_widget(id));
+		VALIDATE(!must_exist || result, missing_widget(std::string(id)));
 
 		return result;
 	}
 
 	template <class T>
-	NOT_DANGLING const T* find_widget(
-		const std::string& id,
+	const T* find_widget(
+		const std::string_view id,
 		const bool must_be_active,
 		const bool must_exist) const
 	{
 		T* result = dynamic_cast<T*>(this->find(id, must_be_active));
-		VALIDATE(!must_exist || result, missing_widget(id));
+		VALIDATE(!must_exist || result, missing_widget(std::string(id)));
 
 		return result;
 	}
@@ -776,16 +775,16 @@ public:
 	 * @returns                   The widget with the id.
 	 */
 	template <class T>
-	NOT_DANGLING T& find_widget(
-		const std::string& id,
+	T& find_widget(
+		const std::string_view id,
 		const bool must_be_active = false)
 	{
 		return *(this->find_widget<T>(id, must_be_active, true));
 	}
 
 	template <class T>
-	NOT_DANGLING const T& find_widget(
-		const std::string& id,
+	const T& find_widget(
+		const std::string_view id,
 		const bool must_be_active = false) const
 	{
 		return *(this->find_widget<T>(id, must_be_active, true));
diff --git a/src/gui/widgets/window.cpp b/src/gui/widgets/window.cpp
index aee9e43323f..41498cd195e 100644
--- a/src/gui/widgets/window.cpp
+++ b/src/gui/widgets/window.cpp
@@ -775,12 +775,12 @@ const widget* window::find_at(const point& coordinate,
 	return panel::find_at(coordinate, must_be_active);
 }
 
-widget* window::find(const std::string& id, const bool must_be_active)
+widget* window::find(const std::string_view id, const bool must_be_active)
 {
 	return container_base::find(id, must_be_active);
 }
 
-const widget* window::find(const std::string& id, const bool must_be_active)
+const widget* window::find(const std::string_view id, const bool must_be_active)
 		const
 {
 	return container_base::find(id, must_be_active);
diff --git a/src/gui/widgets/window.hpp b/src/gui/widgets/window.hpp
index 9b9922c4169..a4ae977845e 100644
--- a/src/gui/widgets/window.hpp
+++ b/src/gui/widgets/window.hpp
@@ -271,11 +271,10 @@ public:
 	}
 
 	/** See @ref widget::find. */
-	widget* find(const std::string& id, const bool must_be_active) override;
+	widget* find(const std::string_view id, const bool must_be_active) override;
 
 	/** See @ref widget::find. */
-	const widget* find(const std::string& id,
-						const bool must_be_active) const override;
+	const widget* find(const std::string_view id, const bool must_be_active) const override;
 
 #if 0
 	/** @todo Implement these functions. */