diff --git a/Source/Core/Core/Core.cpp b/Source/Core/Core/Core.cpp
index f1e3161220..5398d8347b 100644
--- a/Source/Core/Core/Core.cpp
+++ b/Source/Core/Core/Core.cpp
@@ -150,7 +150,7 @@ std::string StopMessage(bool main_thread, const std::string& message)
                           Common::CurrentThreadId(), message.c_str());
 }
 
-void DisplayMessage(const std::string& message, int time_in_ms)
+void DisplayMessage(std::string message, int time_in_ms)
 {
   if (!IsRunning())
     return;
@@ -162,8 +162,8 @@ void DisplayMessage(const std::string& message, int time_in_ms)
       return;
   }
 
-  OSD::AddMessage(message, time_in_ms);
   Host_UpdateTitle(message);
+  OSD::AddMessage(std::move(message), time_in_ms);
 }
 
 bool IsRunning()
diff --git a/Source/Core/Core/Core.h b/Source/Core/Core/Core.h
index 26e30a2d8a..f76823d0e6 100644
--- a/Source/Core/Core/Core.h
+++ b/Source/Core/Core/Core.h
@@ -63,7 +63,7 @@ void SaveScreenShot(const std::string& name, bool wait_for_completion = false);
 void Callback_WiimoteInterruptChannel(int number, u16 channel_id, const u8* data, u32 size);
 
 // This displays messages in a user-visible way.
-void DisplayMessage(const std::string& message, int time_in_ms);
+void DisplayMessage(std::string message, int time_in_ms);
 
 void FrameUpdateOnCPUThread();
 void OnFrameEnd();
diff --git a/Source/Core/Core/DSP/DSPHost.h b/Source/Core/Core/DSP/DSPHost.h
index b0a424806a..d771fd9b48 100644
--- a/Source/Core/Core/DSP/DSPHost.h
+++ b/Source/Core/Core/DSP/DSPHost.h
@@ -17,7 +17,7 @@ namespace DSP::Host
 {
 u8 ReadHostMemory(u32 addr);
 void WriteHostMemory(u8 value, u32 addr);
-void OSD_AddMessage(const std::string& str, u32 ms);
+void OSD_AddMessage(std::string str, u32 ms);
 bool OnThread();
 bool IsWiiHost();
 void InterruptRequest();
diff --git a/Source/Core/Core/HW/DSPLLE/DSPHost.cpp b/Source/Core/Core/HW/DSPLLE/DSPHost.cpp
index b8f42f7e41..ab88e457d2 100644
--- a/Source/Core/Core/HW/DSPLLE/DSPHost.cpp
+++ b/Source/Core/Core/HW/DSPLLE/DSPHost.cpp
@@ -36,9 +36,9 @@ void WriteHostMemory(u8 value, u32 addr)
   DSP::WriteARAM(value, addr);
 }
 
-void OSD_AddMessage(const std::string& str, u32 ms)
+void OSD_AddMessage(std::string str, u32 ms)
 {
-  OSD::AddMessage(str, ms);
+  OSD::AddMessage(std::move(str), ms);
 }
 
 bool OnThread()
diff --git a/Source/Core/DolphinQt/HotkeyScheduler.cpp b/Source/Core/DolphinQt/HotkeyScheduler.cpp
index e43d66c803..1fa4919ec7 100644
--- a/Source/Core/DolphinQt/HotkeyScheduler.cpp
+++ b/Source/Core/DolphinQt/HotkeyScheduler.cpp
@@ -337,7 +337,7 @@ void HotkeyScheduler::Run()
           OSD::AddMessage("Internal Resolution: Native");
           break;
         default:
-          OSD::AddMessage("Internal Resolution: %dx", g_Config.iEFBScale);
+          OSD::AddMessage(StringFromFormat("Internal Resolution: %dx", g_Config.iEFBScale));
           break;
         }
       };
diff --git a/Source/Core/VideoCommon/OnScreenDisplay.cpp b/Source/Core/VideoCommon/OnScreenDisplay.cpp
index a38dc35318..0fb4a55a18 100644
--- a/Source/Core/VideoCommon/OnScreenDisplay.cpp
+++ b/Source/Core/VideoCommon/OnScreenDisplay.cpp
@@ -3,12 +3,11 @@
 // Refer to the license.txt file included.
 
 #include <algorithm>
-#include <list>
 #include <map>
 #include <mutex>
 #include <string>
 
-#include "imgui.h"
+#include <imgui.h>
 
 #include "Common/CommonTypes.h"
 #include "Common/StringUtil.h"
@@ -26,14 +25,14 @@ constexpr float WINDOW_PADDING = 4.0f;  // Pixels between subsequent OSD message
 
 struct Message
 {
-  Message() {}
-  Message(const std::string& text_, u32 timestamp_, u32 color_)
-      : text(text_), timestamp(timestamp_), color(color_)
+  Message() = default;
+  Message(std::string text_, u32 timestamp_, u32 color_)
+      : text(std::move(text_)), timestamp(timestamp_), color(color_)
   {
   }
   std::string text;
-  u32 timestamp;
-  u32 color;
+  u32 timestamp = 0;
+  u32 color = 0;
 };
 static std::multimap<MessageType, Message> s_messages;
 static std::mutex s_messages_mutex;
@@ -79,18 +78,18 @@ static float DrawMessage(int index, const Message& msg, const ImVec2& position,
   return window_height;
 }
 
-void AddTypedMessage(MessageType type, const std::string& message, u32 ms, u32 rgba)
+void AddTypedMessage(MessageType type, std::string message, u32 ms, u32 rgba)
 {
-  std::lock_guard<std::mutex> lock(s_messages_mutex);
+  std::lock_guard lock{s_messages_mutex};
   s_messages.erase(type);
-  s_messages.emplace(type, Message(message, Common::Timer::GetTimeMs() + ms, rgba));
+  s_messages.emplace(type, Message(std::move(message), Common::Timer::GetTimeMs() + ms, rgba));
 }
 
-void AddMessage(const std::string& message, u32 ms, u32 rgba)
+void AddMessage(std::string message, u32 ms, u32 rgba)
 {
-  std::lock_guard<std::mutex> lock(s_messages_mutex);
+  std::lock_guard lock{s_messages_mutex};
   s_messages.emplace(MessageType::Typeless,
-                     Message(message, Common::Timer::GetTimeMs() + ms, rgba));
+                     Message(std::move(message), Common::Timer::GetTimeMs() + ms, rgba));
 }
 
 void DrawMessages()
@@ -99,7 +98,7 @@ void DrawMessages()
     return;
 
   {
-    std::lock_guard<std::mutex> lock(s_messages_mutex);
+    std::lock_guard lock{s_messages_mutex};
 
     const u32 now = Common::Timer::GetTimeMs();
     float current_x = LEFT_MARGIN * ImGui::GetIO().DisplayFramebufferScale.x;
@@ -123,7 +122,7 @@ void DrawMessages()
 
 void ClearMessages()
 {
-  std::lock_guard<std::mutex> lock(s_messages_mutex);
+  std::lock_guard lock{s_messages_mutex};
   s_messages.clear();
 }
 }  // namespace OSD
diff --git a/Source/Core/VideoCommon/OnScreenDisplay.h b/Source/Core/VideoCommon/OnScreenDisplay.h
index 20d563d7ba..7179b9f4c2 100644
--- a/Source/Core/VideoCommon/OnScreenDisplay.h
+++ b/Source/Core/VideoCommon/OnScreenDisplay.h
@@ -37,10 +37,11 @@ constexpr u32 VERY_LONG = 10000;
 };  // namespace Duration
 
 // On-screen message display (colored yellow by default)
-void AddMessage(const std::string& message, u32 ms = Duration::SHORT, u32 rgba = Color::YELLOW);
-void AddTypedMessage(MessageType type, const std::string& message, u32 ms = Duration::SHORT,
+void AddMessage(std::string message, u32 ms = Duration::SHORT, u32 rgba = Color::YELLOW);
+void AddTypedMessage(MessageType type, std::string message, u32 ms = Duration::SHORT,
                      u32 rgba = Color::YELLOW);
-void DrawMessages();  // draw the current messages on the screen. Only call once
-                      // per frame.
+
+// Draw the current messages on the screen. Only call once per frame.
+void DrawMessages();
 void ClearMessages();
 }  // namespace OSD
diff --git a/Source/DSPTool/DSPTool.cpp b/Source/DSPTool/DSPTool.cpp
index f1434fd03e..bd3335189d 100644
--- a/Source/DSPTool/DSPTool.cpp
+++ b/Source/DSPTool/DSPTool.cpp
@@ -22,7 +22,7 @@ u8 DSP::Host::ReadHostMemory(u32 addr)
 void DSP::Host::WriteHostMemory(u8 value, u32 addr)
 {
 }
-void DSP::Host::OSD_AddMessage(const std::string& str, u32 ms)
+void DSP::Host::OSD_AddMessage(std::string str, u32 ms)
 {
 }
 bool DSP::Host::OnThread()