diff --git a/src/common/config.cpp b/src/common/config.cpp
index 24db6b03..6289e2af 100644
--- a/src/common/config.cpp
+++ b/src/common/config.cpp
@@ -189,15 +189,15 @@ void setNeoMode(bool enable) {
     isNeo = enable;
 }
 
-void setLogType(std::string type) {
+void setLogType(const std::string& type) {
     logType = type;
 }
 
-void setLogFilter(std::string type) {
+void setLogFilter(const std::string& type) {
     logFilter = type;
 }
 
-void setUserName(std::string type) {
+void setUserName(const std::string& type) {
     userName = type;
 }
 
@@ -234,15 +234,15 @@ void setMainWindowWidth(u32 width) {
 void setMainWindowHeight(u32 height) {
     m_window_size_H = height;
 }
-void setPkgViewer(std::vector<std::string> pkgList) {
+void setPkgViewer(const std::vector<std::string>& pkgList) {
     m_pkg_viewer.resize(pkgList.size());
     m_pkg_viewer = pkgList;
 }
-void setElfViewer(std::vector<std::string> elfList) {
+void setElfViewer(const std::vector<std::string>& elfList) {
     m_elf_viewer.resize(elfList.size());
     m_elf_viewer = elfList;
 }
-void setRecentFiles(std::vector<std::string> recentFiles) {
+void setRecentFiles(const std::vector<std::string>& recentFiles) {
     m_recent_files.resize(recentFiles.size());
     m_recent_files = recentFiles;
 }
diff --git a/src/common/config.h b/src/common/config.h
index 3006f2e2..f2b7fe09 100644
--- a/src/common/config.h
+++ b/src/common/config.h
@@ -43,10 +43,10 @@ void setScreenHeight(u32 height);
 void setFullscreenMode(bool enable);
 void setLanguage(u32 language);
 void setNeoMode(bool enable);
-void setUserName(std::string type);
+void setUserName(const std::string& type);
 
-void setLogType(std::string type);
-void setLogFilter(std::string type);
+void setLogType(const std::string& type);
+void setLogFilter(const std::string& type);
 
 void setVkValidation(bool enable);
 void setVkSyncValidation(bool enable);
@@ -67,9 +67,9 @@ void setSliderPositonGrid(u32 pos);
 void setTableMode(u32 mode);
 void setMainWindowWidth(u32 width);
 void setMainWindowHeight(u32 height);
-void setPkgViewer(std::vector<std::string> pkgList);
-void setElfViewer(std::vector<std::string> elfList);
-void setRecentFiles(std::vector<std::string> recentFiles);
+void setPkgViewer(const std::vector<std::string>& pkgList);
+void setElfViewer(const std::vector<std::string>& elfList);
+void setRecentFiles(const std::vector<std::string>& recentFiles);
 
 u32 getMainWindowGeometryX();
 u32 getMainWindowGeometryY();
diff --git a/src/common/uint128.h b/src/common/uint128.h
index c4435791..77c4a271 100644
--- a/src/common/uint128.h
+++ b/src/common/uint128.h
@@ -94,7 +94,7 @@ namespace Common {
 
 // This function divides a u128 by a u32 value and produces two u64 values:
 // the result of division and the remainder
-[[nodiscard]] static inline std::pair<u64, u64> Divide128On32(u128 dividend, u32 divisor) {
+[[nodiscard]] static inline std::pair<u64, u64> Divide128On32(const u128& dividend, u32 divisor) {
     u64 remainder = dividend[0] % divisor;
     u64 accum = dividend[0] / divisor;
     if (dividend[1] == 0)
diff --git a/src/core/file_format/playgo_chunk.cpp b/src/core/file_format/playgo_chunk.cpp
index a430b1ac..4e2faea4 100644
--- a/src/core/file_format/playgo_chunk.cpp
+++ b/src/core/file_format/playgo_chunk.cpp
@@ -60,7 +60,7 @@ bool PlaygoFile::LoadChunks(const Common::FS::IOFile& file) {
     return false;
 }
 
-bool PlaygoFile::load_chunk_data(const Common::FS::IOFile& file, const chunk_t& chunk,
+bool PlaygoFile::load_chunk_data(const Common::FS::IOFile& file, const chunk_t chunk,
                                  std::string& data) {
     if (file.IsOpen()) {
         if (file.Seek(chunk.offset)) {
diff --git a/src/core/file_format/playgo_chunk.h b/src/core/file_format/playgo_chunk.h
index 439e27d0..b6d38e0e 100644
--- a/src/core/file_format/playgo_chunk.h
+++ b/src/core/file_format/playgo_chunk.h
@@ -123,7 +123,7 @@ public:
     }
 
 private:
-    bool load_chunk_data(const Common::FS::IOFile& file, const chunk_t& chunk, std::string& data);
+    bool load_chunk_data(const Common::FS::IOFile& file, const chunk_t chunk, std::string& data);
 
 private:
     PlaygoHeader playgoHeader;
diff --git a/src/core/file_format/psf.cpp b/src/core/file_format/psf.cpp
index c11dc05c..3d076acd 100644
--- a/src/core/file_format/psf.cpp
+++ b/src/core/file_format/psf.cpp
@@ -9,7 +9,7 @@ PSF::PSF() = default;
 
 PSF::~PSF() = default;
 
-bool PSF::open(const std::string& filepath, std::vector<u8> psfBuffer) {
+bool PSF::open(const std::string& filepath, const std::vector<u8>& psfBuffer) {
     if (!psfBuffer.empty()) {
         psf.resize(psfBuffer.size());
         psf = psfBuffer;
diff --git a/src/core/file_format/psf.h b/src/core/file_format/psf.h
index 17e515de..9a162b1d 100644
--- a/src/core/file_format/psf.h
+++ b/src/core/file_format/psf.h
@@ -35,7 +35,7 @@ public:
     PSF();
     ~PSF();
 
-    bool open(const std::string& filepath, std::vector<u8> psfBuffer);
+    bool open(const std::string& filepath, const std::vector<u8>& psfBuffer);
 
     std::string GetString(const std::string& key);
     u32 GetInteger(const std::string& key);
diff --git a/src/core/libraries/avplayer/avplayer_source.cpp b/src/core/libraries/avplayer/avplayer_source.cpp
index f5479870..2fc360a0 100644
--- a/src/core/libraries/avplayer/avplayer_source.cpp
+++ b/src/core/libraries/avplayer/avplayer_source.cpp
@@ -82,7 +82,7 @@ static s32 CodecTypeToStreamType(AVMediaType codec_type) {
     }
 }
 
-static f32 AVRationalToF32(const AVRational& rational) {
+static f32 AVRationalToF32(const AVRational rational) {
     return f32(rational.num) / rational.den;
 }
 
diff --git a/src/shader_recompiler/ir/opcodes.h b/src/shader_recompiler/ir/opcodes.h
index 66b60221..06f1a611 100644
--- a/src/shader_recompiler/ir/opcodes.h
+++ b/src/shader_recompiler/ir/opcodes.h
@@ -101,7 +101,7 @@ struct fmt::formatter<Shader::IR::Opcode> {
         return ctx.begin();
     }
     template <typename FormatContext>
-    auto format(const Shader::IR::Opcode& op, FormatContext& ctx) const {
+    auto format(const Shader::IR::Opcode op, FormatContext& ctx) const {
         return fmt::format_to(ctx.out(), "{}", Shader::IR::NameOf(op));
     }
 };