diff --git a/rpcs3/Emu/Audio/Cubeb/cubeb_enumerator.cpp b/rpcs3/Emu/Audio/Cubeb/cubeb_enumerator.cpp
index 877628d5d0..c669d0e87f 100644
--- a/rpcs3/Emu/Audio/Cubeb/cubeb_enumerator.cpp
+++ b/rpcs3/Emu/Audio/Cubeb/cubeb_enumerator.cpp
@@ -104,7 +104,7 @@ std::vector<audio_device_enumerator::audio_device> cubeb_enumerator::get_output_
 		cubeb_dev_enum.error("cubeb_device_collection_destroy() failed: %i", err);
 	}
 
-	std::sort(device_list.begin(), device_list.end(), [](audio_device_enumerator::audio_device a, audio_device_enumerator::audio_device b)
+	std::sort(device_list.begin(), device_list.end(), [](const audio_device_enumerator::audio_device& a, const audio_device_enumerator::audio_device& b)
 	{
 		return a.name < b.name;
 	});
diff --git a/rpcs3/Emu/Audio/XAudio2/xaudio2_enumerator.cpp b/rpcs3/Emu/Audio/XAudio2/xaudio2_enumerator.cpp
index 0655f29dca..e170addb0e 100644
--- a/rpcs3/Emu/Audio/XAudio2/xaudio2_enumerator.cpp
+++ b/rpcs3/Emu/Audio/XAudio2/xaudio2_enumerator.cpp
@@ -144,7 +144,7 @@ std::vector<audio_device_enumerator::audio_device> xaudio2_enumerator::get_outpu
 		device_list.emplace_back(dev);
 	}
 
-	std::sort(device_list.begin(), device_list.end(), [](audio_device_enumerator::audio_device a, audio_device_enumerator::audio_device b)
+	std::sort(device_list.begin(), device_list.end(), [](const audio_device_enumerator::audio_device& a, const audio_device_enumerator::audio_device& b)
 	{
 		return a.name < b.name;
 	});
diff --git a/rpcs3/Emu/Io/Dimensions.cpp b/rpcs3/Emu/Io/Dimensions.cpp
index a8ef6bc447..158f310bdb 100644
--- a/rpcs3/Emu/Io/Dimensions.cpp
+++ b/rpcs3/Emu/Io/Dimensions.cpp
@@ -217,7 +217,7 @@ u32 dimensions_toypad::scramble(const std::array<u8, 7>& uid, u8 count)
 	return read_from_ptr<be_t<u32>>(dimensions_randomize(to_scramble, count).data());
 }
 
-std::array<u8, 4> dimensions_toypad::dimensions_randomize(const std::vector<u8> key, u8 count)
+std::array<u8, 4> dimensions_toypad::dimensions_randomize(const std::vector<u8>& key, u8 count)
 {
 	u32 scrambled = 0;
 	for (u8 i = 0; i < count; i++)
diff --git a/rpcs3/Emu/Io/Dimensions.h b/rpcs3/Emu/Io/Dimensions.h
index 9cf1bd7395..e4886c11f1 100644
--- a/rpcs3/Emu/Io/Dimensions.h
+++ b/rpcs3/Emu/Io/Dimensions.h
@@ -49,7 +49,7 @@ private:
 	static std::array<u8, 16> generate_figure_key(const std::array<u8, 0x2D * 0x04>& buf);
 	static u32 scramble(const std::array<u8, 7>& uid, u8 count);
 	static std::array<u8, 4> pwd_generate(const std::array<u8, 7>& uid);
-	static std::array<u8, 4> dimensions_randomize(const std::vector<u8> key, u8 count);
+	static std::array<u8, 4> dimensions_randomize(const std::vector<u8>& key, u8 count);
 	static u32 get_figure_id(const std::array<u8, 0x2D * 0x04>& buf);
 	u32 get_next();
 	dimensions_figure& get_figure_by_index(u8 index);
diff --git a/rpcs3/Emu/Io/PadHandler.h b/rpcs3/Emu/Io/PadHandler.h
index 792515c5d8..19178f7682 100644
--- a/rpcs3/Emu/Io/PadHandler.h
+++ b/rpcs3/Emu/Io/PadHandler.h
@@ -307,7 +307,7 @@ public:
 	};
 
 	std::vector<pad_ensemble>& bindings() { return m_bindings; }
-	std::string name_string() const { return m_name_string; }
+	const std::string& name_string() const { return m_name_string; }
 	usz max_devices() const { return m_max_devices; }
 	bool has_config() const { return b_has_config; }
 	bool has_rumble() const { return b_has_rumble; }
diff --git a/rpcs3/Emu/RSX/VK/vkutils/framebuffer_object.hpp b/rpcs3/Emu/RSX/VK/vkutils/framebuffer_object.hpp
index ecafa1d827..03ce077bcc 100644
--- a/rpcs3/Emu/RSX/VK/vkutils/framebuffer_object.hpp
+++ b/rpcs3/Emu/RSX/VK/vkutils/framebuffer_object.hpp
@@ -75,7 +75,7 @@ namespace vk
 			return attachments.back()->image()->format();
 		}
 
-		bool matches(std::vector<vk::image*> fbo_images, u32 width, u32 height)
+		bool matches(const std::vector<vk::image*>& fbo_images, u32 width, u32 height)
 		{
 			if (m_width != width || m_height != height)
 				return false;
diff --git a/rpcs3/Emu/RSX/color_utils.h b/rpcs3/Emu/RSX/color_utils.h
index 7d315c66ad..55e9e483fd 100644
--- a/rpcs3/Emu/RSX/color_utils.h
+++ b/rpcs3/Emu/RSX/color_utils.h
@@ -204,7 +204,7 @@ namespace rsx
 		return result;
 	}
 
-	static inline u32 encode_color_to_storage_key(color4f color)
+	static inline u32 encode_color_to_storage_key(const color4f& color)
 	{
 		const u32 r = static_cast<u8>(color.r * 255);
 		const u32 g = static_cast<u8>(color.g * 255);