Expose the `OS.low_processor_usage_mode_sleep_usec` property

This makes it possible to change it at runtime in projects.

core/bind/core_bind.cpp

@@ -468,6 +468,16 @@ bool _OS::is_in_low_processor_usage_mode() const {
 	return OS::get_singleton()->is_in_low_processor_usage_mode();
 }
 
+void _OS::set_low_processor_usage_mode_sleep_usec(int p_usec) {
+
+	OS::get_singleton()->set_low_processor_usage_mode_sleep_usec(p_usec);
+}
+
+int _OS::get_low_processor_usage_mode_sleep_usec() const {
+
+	return OS::get_singleton()->get_low_processor_usage_mode_sleep_usec();
+}
+
 String _OS::get_executable_path() const {
 
 	return OS::get_singleton()->get_executable_path();
@@ -1232,6 +1242,9 @@ void _OS::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("set_low_processor_usage_mode", "enable"), &_OS::set_low_processor_usage_mode);
 	ClassDB::bind_method(D_METHOD("is_in_low_processor_usage_mode"), &_OS::is_in_low_processor_usage_mode);
 
+	ClassDB::bind_method(D_METHOD("set_low_processor_usage_mode_sleep_usec", "usec"), &_OS::set_low_processor_usage_mode_sleep_usec);
+	ClassDB::bind_method(D_METHOD("get_low_processor_usage_mode_sleep_usec"), &_OS::get_low_processor_usage_mode_sleep_usec);
+
 	ClassDB::bind_method(D_METHOD("get_processor_count"), &_OS::get_processor_count);
 
 	ClassDB::bind_method(D_METHOD("get_executable_path"), &_OS::get_executable_path);
@@ -1337,6 +1350,7 @@ void _OS::_bind_methods() {
 	ADD_PROPERTY(PropertyInfo(Variant::INT, "exit_code"), "set_exit_code", "get_exit_code");
 	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "vsync_enabled"), "set_use_vsync", "is_vsync_enabled");
 	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "low_processor_usage_mode"), "set_low_processor_usage_mode", "is_in_low_processor_usage_mode");
+	ADD_PROPERTY(PropertyInfo(Variant::INT, "low_processor_usage_mode_sleep_usec"), "set_low_processor_usage_mode_sleep_usec", "get_low_processor_usage_mode_sleep_usec");
 	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "keep_screen_on"), "set_keep_screen_on", "is_keep_screen_on");
 	ADD_PROPERTY(PropertyInfo(Variant::VECTOR2, "min_window_size"), "set_min_window_size", "get_min_window_size");
 	ADD_PROPERTY(PropertyInfo(Variant::VECTOR2, "max_window_size"), "set_max_window_size", "get_max_window_size");
@@ -1358,6 +1372,7 @@ void _OS::_bind_methods() {
 	ADD_PROPERTY_DEFAULT("exit_code", 0);
 	ADD_PROPERTY_DEFAULT("vsync_enabled", true);
 	ADD_PROPERTY_DEFAULT("low_processor_usage_mode", false);
+	ADD_PROPERTY_DEFAULT("low_processor_usage_mode_sleep_usec", 6900);
 	ADD_PROPERTY_DEFAULT("keep_screen_on", true);
 	ADD_PROPERTY_DEFAULT("min_window_size", Vector2());
 	ADD_PROPERTY_DEFAULT("max_window_size", Vector2());

core/bind/core_bind.h

@@ -222,6 +222,9 @@ public:
 	void set_low_processor_usage_mode(bool p_enabled);
 	bool is_in_low_processor_usage_mode() const;
 
+	void set_low_processor_usage_mode_sleep_usec(int p_usec);
+	int get_low_processor_usage_mode_sleep_usec() const;
+
 	String get_executable_path() const;
 	int execute(const String &p_path, const Vector<String> &p_arguments, bool p_blocking, Array p_output = Array(), bool p_read_stderr = false);
 

doc/classes/OS.xml

@@ -878,6 +878,9 @@
 		<member name="low_processor_usage_mode" type="bool" setter="set_low_processor_usage_mode" getter="is_in_low_processor_usage_mode" default="false">
 			If [code]true[/code], the engine optimizes for low processor usage by only refreshing the screen if needed. Can improve battery consumption on mobile.
 		</member>
+		<member name="low_processor_usage_mode_sleep_usec" type="int" setter="set_low_processor_usage_mode_sleep_usec" getter="get_low_processor_usage_mode_sleep_usec" default="6900">
+			The amount of sleeping between frames when the low-processor usage mode is enabled (in microseconds). Higher values will result in lower CPU usage.
+		</member>
 		<member name="max_window_size" type="Vector2" setter="set_max_window_size" getter="get_max_window_size" default="Vector2( 0, 0 )">
 			The maximum size of the window (without counting window manager decorations). Does not affect fullscreen mode. Set to [code](0, 0)[/code] to reset to the system default value.
 		</member>