diff --git a/include/loot/database_interface.h b/include/loot/database_interface.h
index 488ef644..ee30515e 100644
--- a/include/loot/database_interface.h
+++ b/include/loot/database_interface.h
@@ -27,6 +27,7 @@
 #include <filesystem>
 #include <optional>
 #include <string>
+#include <string_view>
 #include <vector>
 
 #include "loot/exception/cyclic_interaction_error.h"
@@ -175,8 +176,8 @@ public:
    *          exists.
    */
   virtual std::vector<Vertex> GetGroupsPath(
-      const std::string& fromGroupName,
-      const std::string& toGroupName) const = 0;
+      std::string_view fromGroupName,
+      std::string_view toGroupName) const = 0;
 
   /**
    * @}
@@ -200,7 +201,7 @@ public:
    *          otherwise an optional containing no value.
    */
   virtual std::optional<PluginMetadata> GetPluginMetadata(
-      const std::string& plugin,
+      std::string_view plugin,
       bool includeUserMetadata = true,
       bool evaluateConditions = false) const = 0;
 
@@ -216,7 +217,7 @@ public:
    *          that metadata, otherwise an optional containing no value.
    */
   virtual std::optional<PluginMetadata> GetPluginUserMetadata(
-      const std::string& plugin,
+      std::string_view plugin,
       bool evaluateConditions = false) const = 0;
 
   /**
@@ -235,7 +236,7 @@ public:
    *        The filename of the plugin for which all user-added metadata
    *        should be deleted.
    */
-  virtual void DiscardPluginUserMetadata(const std::string& plugin) = 0;
+  virtual void DiscardPluginUserMetadata(std::string_view plugin) = 0;
 
   /**
    * @brief Discards all loaded user metadata for all plugins, and any
diff --git a/include/loot/exception/undefined_group_error.h b/include/loot/exception/undefined_group_error.h
index 008b3ae0..27dfea1e 100644
--- a/include/loot/exception/undefined_group_error.h
+++ b/include/loot/exception/undefined_group_error.h
@@ -26,6 +26,7 @@
 #define LOOT_EXCEPTION_UNDEFINED_GROUP_ERROR
 
 #include <stdexcept>
+#include <string_view>
 
 #include "loot/api_decorator.h"
 
@@ -39,7 +40,7 @@ public:
    * @brief Construct an exception for an undefined group.
    * @param groupName The name of the group that is undefined.
    */
-  LOOT_API UndefinedGroupError(const std::string& groupName);
+  LOOT_API UndefinedGroupError(std::string_view groupName);
 
   /**
    * Get the name of the undefined group.
diff --git a/include/loot/game_interface.h b/include/loot/game_interface.h
index a2e39799..3ebcf1f2 100644
--- a/include/loot/game_interface.h
+++ b/include/loot/game_interface.h
@@ -142,7 +142,7 @@ public:
    *          a case-insensitively equal filename is loaded.
    */
   virtual std::shared_ptr<const PluginInterface> GetPlugin(
-      const std::string& pluginName) const = 0;
+      std::string_view pluginName) const = 0;
 
   /**
    * @brief Get a set of const references to all loaded plugins' PluginInterface
diff --git a/include/loot/metadata/conditional_metadata.h b/include/loot/metadata/conditional_metadata.h
index cd47658b..e175670c 100644
--- a/include/loot/metadata/conditional_metadata.h
+++ b/include/loot/metadata/conditional_metadata.h
@@ -25,6 +25,7 @@
 #define LOOT_METADATA_CONDITIONAL_METADATA
 
 #include <string>
+#include <string_view>
 
 #include "loot/api_decorator.h"
 
@@ -48,7 +49,7 @@ public:
    *         documentation.
    * @return A ConditionalMetadata object.
    */
-  LOOT_API explicit ConditionalMetadata(const std::string& condition);
+  LOOT_API explicit ConditionalMetadata(std::string_view condition);
 
   /**
    * Check if the condition string is non-empty.
diff --git a/include/loot/metadata/file.h b/include/loot/metadata/file.h
index e7d1934d..526e082d 100644
--- a/include/loot/metadata/file.h
+++ b/include/loot/metadata/file.h
@@ -25,6 +25,7 @@
 #define LOOT_METADATA_FILE
 
 #include <string>
+#include <string_view>
 
 #include "loot/api_decorator.h"
 #include "loot/metadata/conditional_metadata.h"
@@ -58,9 +59,9 @@ public:
    *         English.
    * @return A File object.
    */
-  LOOT_API explicit File(const std::string& name,
-                         const std::string& display = "",
-                         const std::string& condition = "",
+  LOOT_API explicit File(std::string_view name,
+                         std::string_view display = "",
+                         std::string_view condition = "",
                          const std::vector<MessageContent>& detail = {});
 
   /**
diff --git a/include/loot/metadata/filename.h b/include/loot/metadata/filename.h
index b09fa2be..3c7fc9c9 100644
--- a/include/loot/metadata/filename.h
+++ b/include/loot/metadata/filename.h
@@ -25,6 +25,7 @@
 #define LOOT_METADATA_FILENAME
 
 #include <string>
+#include <string_view>
 
 #include "loot/api_decorator.h"
 
@@ -44,7 +45,7 @@ public:
    * Construct a Filename using the given string.
    * @return A Filename object.
    */
-  LOOT_API explicit Filename(const std::string& filename);
+  LOOT_API explicit Filename(std::string_view filename);
 
   /**
    * Get this Filename as a string.
diff --git a/include/loot/metadata/group.h b/include/loot/metadata/group.h
index adf78ce3..e553f12a 100644
--- a/include/loot/metadata/group.h
+++ b/include/loot/metadata/group.h
@@ -25,6 +25,7 @@
 #define LOOT_METADATA_GROUP
 
 #include <string>
+#include <string_view>
 #include <vector>
 
 #include "loot/api_decorator.h"
@@ -58,9 +59,9 @@ public:
    *         A description of the group.
    * @return A Group object.
    */
-  LOOT_API explicit Group(const std::string& name,
+  LOOT_API explicit Group(std::string_view name,
                           const std::vector<std::string>& afterGroups = {},
-                          const std::string& description = "");
+                          std::string_view description = "");
 
   /**
    * Get the name of the group.
diff --git a/include/loot/metadata/location.h b/include/loot/metadata/location.h
index 66b319f7..7f32eca4 100644
--- a/include/loot/metadata/location.h
+++ b/include/loot/metadata/location.h
@@ -25,6 +25,7 @@
 #define LOOT_METADATA_LOCATION
 
 #include <string>
+#include <string_view>
 #include <vector>
 
 #include "loot/api_decorator.h"
@@ -49,8 +50,8 @@ public:
    *         A name for the URL, eg. the page or site name.
    * @return A Location object.
    */
-  LOOT_API explicit Location(const std::string& url,
-                             const std::string& name = "");
+  LOOT_API explicit Location(std::string_view url,
+                             std::string_view name = "");
 
   /**
    * Get the object's URL.
diff --git a/include/loot/metadata/message.h b/include/loot/metadata/message.h
index 735d59b1..1509a640 100644
--- a/include/loot/metadata/message.h
+++ b/include/loot/metadata/message.h
@@ -25,6 +25,7 @@
 #define LOOT_METADATA_MESSAGE
 
 #include <string>
+#include <string_view>
 #include <vector>
 
 #include "loot/api_decorator.h"
@@ -57,8 +58,8 @@ public:
    * @return A Message object.
    */
   LOOT_API explicit Message(const MessageType type,
-                            const std::string& content,
-                            const std::string& condition = "");
+                            std::string_view content,
+                            std::string_view condition = "");
 
   /**
    * Construct a Message object with the given type, content and condition
@@ -73,7 +74,7 @@ public:
    */
   LOOT_API explicit Message(const MessageType type,
                             const std::vector<MessageContent>& content,
-                            const std::string& condition = "");
+                            std::string_view condition = "");
 
   /**
    * Get the message type.
diff --git a/include/loot/metadata/message_content.h b/include/loot/metadata/message_content.h
index 9a3b4c07..6fef605c 100644
--- a/include/loot/metadata/message_content.h
+++ b/include/loot/metadata/message_content.h
@@ -26,6 +26,7 @@
 
 #include <optional>
 #include <string>
+#include <string_view>
 #include <vector>
 
 #include "loot/api_decorator.h"
@@ -57,8 +58,8 @@ public:
    * @return A MessageContent object.
    */
   LOOT_API explicit MessageContent(
-      const std::string& text,
-      const std::string& language = DEFAULT_LANGUAGE);
+      std::string_view text,
+      std::string_view language = DEFAULT_LANGUAGE);
 
   /**
    * Get the message text.
@@ -144,7 +145,7 @@ LOOT_API bool operator>=(const MessageContent& lhs, const MessageContent& rhs);
  */
 LOOT_API std::optional<MessageContent> SelectMessageContent(
     const std::vector<MessageContent> content,
-    const std::string& language);
+    std::string_view language);
 }
 
 #endif
diff --git a/include/loot/metadata/plugin_cleaning_data.h b/include/loot/metadata/plugin_cleaning_data.h
index 8ed59662..bb429927 100644
--- a/include/loot/metadata/plugin_cleaning_data.h
+++ b/include/loot/metadata/plugin_cleaning_data.h
@@ -27,6 +27,7 @@
 
 #include <cstdint>
 #include <string>
+#include <string_view>
 
 #include "loot/api_decorator.h"
 #include "loot/metadata/message.h"
@@ -57,7 +58,7 @@ public:
    * @return A PluginCleaningData object.
    */
   LOOT_API explicit PluginCleaningData(uint32_t crc,
-                                       const std::string& utility);
+                                       std::string_view utility);
 
   /**
    * Construct a PluginCleaningData object with the given values.
@@ -78,7 +79,7 @@ public:
    */
   LOOT_API explicit PluginCleaningData(
       uint32_t crc,
-      const std::string& utility,
+      std::string_view utility,
       const std::vector<MessageContent>& detail,
       unsigned int itm,
       unsigned int ref,
diff --git a/include/loot/metadata/plugin_metadata.h b/include/loot/metadata/plugin_metadata.h
index da821a90..59619544 100644
--- a/include/loot/metadata/plugin_metadata.h
+++ b/include/loot/metadata/plugin_metadata.h
@@ -30,6 +30,7 @@
 #include <regex>
 #include <set>
 #include <string>
+#include <string_view>
 #include <vector>
 
 #include "loot/api_decorator.h"
@@ -58,7 +59,7 @@ public:
    *         The filename of the plugin that the object is constructed for.
    * @return A PluginMetadata object.
    */
-  LOOT_API explicit PluginMetadata(const std::string& name);
+  LOOT_API explicit PluginMetadata(std::string_view name);
 
   /**
    * Merge metadata from the given PluginMetadata object into this object.
@@ -138,7 +139,7 @@ public:
    * @param group
    *        The name of the group this plugin belongs to.
    */
-  LOOT_API void SetGroup(const std::string& group);
+  LOOT_API void SetGroup(std::string_view group);
 
   /**
    * Unsets the plugin's group.
@@ -227,7 +228,7 @@ public:
    * @returns True if the given plugin name matches this metadata's plugin
    *          name, false otherwise.
    */
-  LOOT_API bool NameMatches(const std::string& pluginName) const;
+  LOOT_API bool NameMatches(std::string_view pluginName) const;
 
   /**
    *  @brief Serialises the plugin metadata as YAML.
diff --git a/include/loot/metadata/tag.h b/include/loot/metadata/tag.h
index 1138b3cc..09f9249e 100644
--- a/include/loot/metadata/tag.h
+++ b/include/loot/metadata/tag.h
@@ -25,6 +25,7 @@
 #define LOOT_METADATA_TAG
 
 #include <string>
+#include <string_view>
 
 #include "loot/api_decorator.h"
 #include "loot/metadata/conditional_metadata.h"
@@ -53,9 +54,9 @@ public:
    *         A condition string.
    * @return A Tag object.
    */
-  LOOT_API explicit Tag(const std::string& tag,
+  LOOT_API explicit Tag(std::string_view tag,
                         const bool isAddition = true,
-                        const std::string& condition = "");
+                        std::string_view condition = "");
 
   /**
    * Check if the tag should be added.
diff --git a/include/loot/plugin_interface.h b/include/loot/plugin_interface.h
index 4bec165d..1d7621ac 100644
--- a/include/loot/plugin_interface.h
+++ b/include/loot/plugin_interface.h
@@ -28,6 +28,7 @@
 #include <optional>
 #include <set>
 #include <string>
+#include <string_view>
 #include <vector>
 
 #include "loot/metadata/message.h"
diff --git a/include/loot/vertex.h b/include/loot/vertex.h
index 861d652c..f18de6b3 100644
--- a/include/loot/vertex.h
+++ b/include/loot/vertex.h
@@ -27,6 +27,7 @@ along with LOOT.  If not, see
 
 #include <optional>
 #include <string>
+#include <string_view>
 
 #include "loot/api_decorator.h"
 #include "loot/enum/edge_type.h"
@@ -42,14 +43,14 @@ public:
    * @brief Construct a Vertex with the given name and no out edge.
    * @param name The name of the plugin or group that this vertex represents.
    */
-  LOOT_API explicit Vertex(std::string name);
+  LOOT_API explicit Vertex(std::string_view name);
 
   /**
    * @brief Construct a Vertex with the given name and out edge type.
    * @param name The name of the plugin or group that this vertex represents.
    * @param outEdgeType The type of the edge going out from this vertex.
    */
-  LOOT_API explicit Vertex(std::string name, EdgeType outEdgeType);
+  LOOT_API explicit Vertex(std::string_view name, EdgeType outEdgeType);
 
   /**
    * @brief Get the name of the plugin or group.
diff --git a/src/api/api_database.cpp b/src/api/api_database.cpp
index a82a901a..e1c1794c 100644
--- a/src/api/api_database.cpp
+++ b/src/api/api_database.cpp
@@ -203,8 +203,8 @@ void ApiDatabase::SetUserGroups(const std::vector<Group>& groups) {
 }
 
 std::vector<Vertex> ApiDatabase::GetGroupsPath(
-    const std::string& fromGroupName,
-    const std::string& toGroupName) const {
+    std::string_view fromGroupName,
+    std::string_view toGroupName) const {
   auto masterlistGroups = GetGroups(false);
   auto userGroups = GetUserGroups();
 
@@ -214,7 +214,7 @@ std::vector<Vertex> ApiDatabase::GetGroupsPath(
 }
 
 std::optional<PluginMetadata> ApiDatabase::GetPluginMetadata(
-    const std::string& plugin,
+    std::string_view plugin,
     bool includeUserMetadata,
     bool evaluateConditions) const {
   auto metadata = masterlist_.FindPlugin(plugin);
@@ -237,7 +237,7 @@ std::optional<PluginMetadata> ApiDatabase::GetPluginMetadata(
 }
 
 std::optional<PluginMetadata> ApiDatabase::GetPluginUserMetadata(
-    const std::string& plugin,
+    std::string_view plugin,
     bool evaluateConditions) const {
   auto metadata = userlist_.FindPlugin(plugin);
 
@@ -253,7 +253,7 @@ void ApiDatabase::SetPluginUserMetadata(const PluginMetadata& pluginMetadata) {
   userlist_.AddPlugin(pluginMetadata);
 }
 
-void ApiDatabase::DiscardPluginUserMetadata(const std::string& plugin) {
+void ApiDatabase::DiscardPluginUserMetadata(std::string_view plugin) {
   userlist_.ErasePlugin(plugin);
 }
 
diff --git a/src/api/api_database.h b/src/api/api_database.h
index 161396d4..88931d38 100644
--- a/src/api/api_database.h
+++ b/src/api/api_database.h
@@ -64,21 +64,21 @@ struct ApiDatabase final : public DatabaseInterface {
   std::vector<Group> GetUserGroups() const override;
   void SetUserGroups(const std::vector<Group>& groups) override;
   std::vector<Vertex> GetGroupsPath(
-      const std::string& fromGroupName,
-      const std::string& toGroupName) const override;
+      std::string_view fromGroupName,
+      std::string_view toGroupName) const override;
 
   std::optional<PluginMetadata> GetPluginMetadata(
-      const std::string& plugin,
+      std::string_view plugin,
       bool includeUserMetadata = true,
       bool evaluateConditions = false) const override;
 
   std::optional<PluginMetadata> GetPluginUserMetadata(
-      const std::string& plugin,
+      std::string_view plugin,
       bool evaluateConditions = false) const override;
 
   void SetPluginUserMetadata(const PluginMetadata& pluginMetadata) override;
 
-  void DiscardPluginUserMetadata(const std::string& plugin) override;
+  void DiscardPluginUserMetadata(std::string_view plugin) override;
 
   void DiscardAllUserMetadata() override;
 
diff --git a/src/api/game/game.cpp b/src/api/game/game.cpp
index 7de857fc..812fa6b8 100644
--- a/src/api/game/game.cpp
+++ b/src/api/game/game.cpp
@@ -312,7 +312,7 @@ void Game::LoadPlugins(const std::vector<std::filesystem::path>& pluginPaths,
 void Game::ClearLoadedPlugins() { cache_.ClearCachedPlugins(); }
 
 std::shared_ptr<const PluginInterface> Game::GetPlugin(
-    const std::string& pluginName) const {
+    std::string_view pluginName) const {
   return cache_.GetPlugin(pluginName);
 }
 
@@ -380,7 +380,7 @@ std::filesystem::path Game::GetActivePluginsFilePath() const {
 }
 
 bool Game::IsPluginActive(const std::string& pluginName) const {
-  return loadOrderHandler_.IsPluginActive(pluginName);
+  return loadOrderHandler_.IsPluginActive(std::string(pluginName));
 }
 
 std::vector<std::string> Game::GetLoadOrder() const {
diff --git a/src/api/game/game.h b/src/api/game/game.h
index cc60048c..7733faba 100644
--- a/src/api/game/game.h
+++ b/src/api/game/game.h
@@ -73,7 +73,7 @@ public:
   void ClearLoadedPlugins() override;
 
   std::shared_ptr<const PluginInterface> GetPlugin(
-      const std::string& pluginName) const override;
+      std::string_view pluginName) const override;
 
   std::vector<std::shared_ptr<const PluginInterface>> GetLoadedPlugins()
       const override;
diff --git a/src/api/game/load_order_handler.cpp b/src/api/game/load_order_handler.cpp
index aca230c6..f071dc65 100644
--- a/src/api/game/load_order_handler.cpp
+++ b/src/api/game/load_order_handler.cpp
@@ -203,7 +203,7 @@ std::filesystem::path LoadOrderHandler::GetActivePluginsFilePath() const {
 
   HandleError("get active plugins file path", ret);
 
-  const auto filePath = std::filesystem::u8path(std::string(filePathCString));
+  const auto filePath = std::filesystem::u8path(std::string_view(filePathCString));
 
   lo_free_string(filePathCString);
 
@@ -227,7 +227,7 @@ std::vector<std::filesystem::path> LoadOrderHandler::GetAdditionalDataPaths()
 
   std::vector<std::filesystem::path> loadOrder;
   for (size_t i = 0; i < pathArrSize; i += 1) {
-    loadOrder.push_back(std::filesystem::u8path(std::string(pathArr[i])));
+    loadOrder.push_back(std::filesystem::u8path(std::string_view(pathArr[i])));
   }
   lo_free_string_array(pathArr, pathArrSize);
 
diff --git a/src/api/metadata/conditional_metadata.cpp b/src/api/metadata/conditional_metadata.cpp
index f778f686..c660ed80 100644
--- a/src/api/metadata/conditional_metadata.cpp
+++ b/src/api/metadata/conditional_metadata.cpp
@@ -25,7 +25,7 @@
 #include "loot/metadata/conditional_metadata.h"
 
 namespace loot {
-ConditionalMetadata::ConditionalMetadata(const std::string& condition) :
+ConditionalMetadata::ConditionalMetadata(std::string_view condition) :
     condition_(condition) {}
 
 bool ConditionalMetadata::IsConditional() const { return !condition_.empty(); }
diff --git a/src/api/metadata/file.cpp b/src/api/metadata/file.cpp
index 132ec0fa..d8fd09b8 100644
--- a/src/api/metadata/file.cpp
+++ b/src/api/metadata/file.cpp
@@ -25,9 +25,9 @@
 #include "loot/metadata/file.h"
 
 namespace loot {
-File::File(const std::string& name,
-           const std::string& display,
-           const std::string& condition,
+File::File(std::string_view name,
+           std::string_view display,
+           std::string_view condition,
            const std::vector<MessageContent>& detail) :
     ConditionalMetadata(condition),
     name_(Filename(name)),
diff --git a/src/api/metadata/filename.cpp b/src/api/metadata/filename.cpp
index 771b6113..04c2be6e 100644
--- a/src/api/metadata/filename.cpp
+++ b/src/api/metadata/filename.cpp
@@ -27,7 +27,7 @@
 #include "api/helpers/text.h"
 
 namespace loot {
-Filename::Filename(const std::string& filename) : filename_(filename) {}
+Filename::Filename(std::string_view filename) : filename_(filename) {}
 
 Filename::operator std::string() const { return filename_; }
 
diff --git a/src/api/metadata/group.cpp b/src/api/metadata/group.cpp
index a3117f16..4205d17f 100644
--- a/src/api/metadata/group.cpp
+++ b/src/api/metadata/group.cpp
@@ -25,9 +25,9 @@
 #include "loot/metadata/group.h"
 
 namespace loot {
-Group::Group(const std::string& name,
+Group::Group(std::string_view name,
              const std::vector<std::string>& afterGroups,
-             const std::string& description) :
+             std::string_view description) :
     name_(name), description_(description), afterGroups_(afterGroups) {}
 
 std::string Group::GetName() const { return name_; }
diff --git a/src/api/metadata/location.cpp b/src/api/metadata/location.cpp
index ac669ee6..7b540212 100644
--- a/src/api/metadata/location.cpp
+++ b/src/api/metadata/location.cpp
@@ -25,7 +25,7 @@
 #include "loot/metadata/location.h"
 
 namespace loot {
-Location::Location(const std::string& url, const std::string& name) :
+Location::Location(std::string_view url, std::string_view name) :
     url_(url), name_(name) {}
 
 std::string Location::GetURL() const { return url_; }
diff --git a/src/api/metadata/message.cpp b/src/api/metadata/message.cpp
index ca152ab2..c3dec404 100644
--- a/src/api/metadata/message.cpp
+++ b/src/api/metadata/message.cpp
@@ -28,15 +28,15 @@
 
 namespace loot {
 Message::Message(const MessageType type,
-                 const std::string& content,
-                 const std::string& condition) :
+                 std::string_view content,
+                 std::string_view condition) :
     ConditionalMetadata(condition),
     type_(type),
     content_({MessageContent(content)}) {}
 
 Message::Message(const MessageType type,
                  const std::vector<MessageContent>& content,
-                 const std::string& condition) :
+                 std::string_view condition) :
     ConditionalMetadata(condition), type_(type), content_(content) {
   if (content.size() > 1) {
     bool englishStringExists = false;
diff --git a/src/api/metadata/message_content.cpp b/src/api/metadata/message_content.cpp
index 4458551a..c184af48 100644
--- a/src/api/metadata/message_content.cpp
+++ b/src/api/metadata/message_content.cpp
@@ -25,8 +25,8 @@
 #include "loot/metadata/message_content.h"
 
 namespace loot {
-MessageContent::MessageContent(const std::string& text,
-                               const std::string& language) :
+MessageContent::MessageContent(std::string_view text,
+                               std::string_view language) :
     text_(text), language_(language) {}
 
 std::string MessageContent::GetText() const { return text_; }
@@ -68,7 +68,7 @@ bool operator>=(const MessageContent& lhs, const MessageContent& rhs) {
 
 std::optional<MessageContent> SelectMessageContent(
     const std::vector<MessageContent> content,
-    const std::string& language) {
+    std::string_view language) {
   if (content.empty())
     return std::nullopt;
   else if (content.size() == 1)
diff --git a/src/api/metadata/plugin_cleaning_data.cpp b/src/api/metadata/plugin_cleaning_data.cpp
index 8dc5d9fc..fd5b12d7 100644
--- a/src/api/metadata/plugin_cleaning_data.cpp
+++ b/src/api/metadata/plugin_cleaning_data.cpp
@@ -26,12 +26,12 @@
 
 namespace loot {
 PluginCleaningData::PluginCleaningData(uint32_t crc,
-                                       const std::string& utility) :
+                                       std::string_view utility) :
     crc_(crc), utility_(utility) {}
 
 PluginCleaningData::PluginCleaningData(
     uint32_t crc,
-    const std::string& utility,
+    std::string_view utility,
     const std::vector<MessageContent>& detail,
     unsigned int itm,
     unsigned int ref,
diff --git a/src/api/metadata/plugin_metadata.cpp b/src/api/metadata/plugin_metadata.cpp
index ce880e62..4d78db5b 100644
--- a/src/api/metadata/plugin_metadata.cpp
+++ b/src/api/metadata/plugin_metadata.cpp
@@ -51,7 +51,7 @@ std::vector<T> mergeVectors(std::vector<T> first,
 
 namespace loot {
 // If the name passed ends in '.ghost', that should be trimmed.
-PluginMetadata::PluginMetadata(const std::string& n) :
+PluginMetadata::PluginMetadata(std::string_view n) :
     name_(TrimDotGhostExtension(std::string(n))) {
   if (IsRegexPlugin()) {
     nameRegex_ = std::regex(name_, std::regex::ECMAScript | std::regex::icase);
@@ -116,7 +116,7 @@ std::vector<Location> PluginMetadata::GetLocations() const {
   return locations_;
 }
 
-void PluginMetadata::SetGroup(const std::string& group) { group_ = group; }
+void PluginMetadata::SetGroup(std::string_view group) { group_ = group; }
 
 void PluginMetadata::UnsetGroup() { group_ = std::nullopt; }
 
@@ -164,13 +164,13 @@ bool PluginMetadata::IsRegexPlugin() const {
   return strpbrk(name_.c_str(), ":\\*?|") != nullptr;
 }
 
-bool PluginMetadata::NameMatches(const std::string& pluginName) const {
+bool PluginMetadata::NameMatches(std::string_view pluginName) const {
   if (IsRegexPlugin()) {
     if (!nameRegex_.has_value()) {
       throw std::runtime_error("Regex plugin does not have regex object");
     }
 
-    return std::regex_match(pluginName, nameRegex_.value());
+    return std::regex_match(pluginName.begin(), pluginName.end(), nameRegex_.value());
   }
 
   return CompareFilenames(name_, pluginName) == 0;
diff --git a/src/api/metadata/tag.cpp b/src/api/metadata/tag.cpp
index 1a551ad5..80640d0b 100644
--- a/src/api/metadata/tag.cpp
+++ b/src/api/metadata/tag.cpp
@@ -25,9 +25,9 @@
 #include "loot/metadata/tag.h"
 
 namespace loot {
-Tag::Tag(const std::string& tag,
+Tag::Tag(std::string_view tag,
          const bool isAddition,
-         const std::string& condition) :
+         std::string_view condition) :
     ConditionalMetadata(condition), name_(tag), addTag_(isAddition) {}
 
 bool Tag::IsAddition() const { return addTag_; }
diff --git a/src/api/metadata_list.cpp b/src/api/metadata_list.cpp
index 1364af4a..c253b436 100644
--- a/src/api/metadata_list.cpp
+++ b/src/api/metadata_list.cpp
@@ -320,7 +320,7 @@ void MetadataList::SetGroups(const std::vector<Group>& groups) {
 
 // Merges multiple matching regex entries if any are found.
 std::optional<PluginMetadata> MetadataList::FindPlugin(
-    const std::string& pluginName) const {
+    std::string_view pluginName) const {
   PluginMetadata match(pluginName);
 
   const auto it = plugins_.find(Filename(pluginName));
@@ -359,7 +359,7 @@ void MetadataList::AddPlugin(const PluginMetadata& plugin) {
 
 // Doesn't erase matching regex entries, because they might also
 // be required for other plugins.
-void MetadataList::ErasePlugin(const std::string& pluginName) {
+void MetadataList::ErasePlugin(std::string_view pluginName) {
   const auto it = plugins_.find(Filename(pluginName));
 
   if (it != plugins_.end()) {
diff --git a/src/api/metadata_list.h b/src/api/metadata_list.h
index 3d3ca8f0..1eef8705 100644
--- a/src/api/metadata_list.h
+++ b/src/api/metadata_list.h
@@ -70,12 +70,12 @@ public:
   void SetGroups(const std::vector<Group>& groups);
 
   // Merges multiple matching regex entries if any are found.
-  std::optional<PluginMetadata> FindPlugin(const std::string& pluginName) const;
+  std::optional<PluginMetadata> FindPlugin(std::string_view pluginName) const;
   void AddPlugin(const PluginMetadata& plugin);
 
   // Doesn't erase matching regex entries, because they might also
   // be required for other plugins.
-  void ErasePlugin(const std::string& pluginName);
+  void ErasePlugin(std::string_view pluginName);
 
   void AppendMessage(const Message& message);
 
diff --git a/src/api/sorting/undefined_group_error.cpp b/src/api/sorting/undefined_group_error.cpp
index c955d1ce..4b6ce90d 100644
--- a/src/api/sorting/undefined_group_error.cpp
+++ b/src/api/sorting/undefined_group_error.cpp
@@ -24,8 +24,8 @@
 #include "loot/exception/undefined_group_error.h"
 
 namespace loot {
-UndefinedGroupError::UndefinedGroupError(const std::string& groupName) :
-      std::runtime_error("The group \"" + groupName + "\" does not exist"),
+UndefinedGroupError::UndefinedGroupError(std::string_view groupName) :
+      std::runtime_error("The group \"" + std::string(groupName) + "\" does not exist"),
       groupName_(groupName) {}
 
 std::string UndefinedGroupError::GetGroupName() const { return groupName_; }
diff --git a/src/api/vertex.cpp b/src/api/vertex.cpp
index fb6a345b..ee1bf9af 100644
--- a/src/api/vertex.cpp
+++ b/src/api/vertex.cpp
@@ -24,9 +24,9 @@
 #include "loot/vertex.h"
 
 namespace loot {
-Vertex::Vertex(std::string name) : name_(name) {}
+Vertex::Vertex(std::string_view name) : name_(name) {}
 
-Vertex::Vertex(std::string name, EdgeType outEdgeType) :
+Vertex::Vertex(std::string_view name, EdgeType outEdgeType) :
     name_(name), outEdgeType_(outEdgeType) {}
 
 std::string Vertex::GetName() const { return name_; }