diff --git a/launcher/cli/include/cmdinterface.h b/launcher/cli/include/cmdinterface.h
index f093f83..27012a7 100644
--- a/launcher/cli/include/cmdinterface.h
+++ b/launcher/cli/include/cmdinterface.h
@@ -8,7 +8,7 @@
  */
 class CMDInterface {
 public:
-    CMDInterface(QCommandLineParser& parser);
+    explicit CMDInterface(QCommandLineParser& parser);
 
     bool parse(QCommandLineParser& parser, LauncherCore& core);
 
diff --git a/launcher/cli/src/cmdinterface.cpp b/launcher/cli/src/cmdinterface.cpp
index 998177f..542142b 100644
--- a/launcher/cli/src/cmdinterface.cpp
+++ b/launcher/cli/src/cmdinterface.cpp
@@ -1,6 +1,5 @@
 #include "cmdinterface.h"
 #include "sapphirelauncher.h"
-#include "squareboot.h"
 #include <keychain.h>
 
 CMDInterface::CMDInterface(QCommandLineParser& parser) {
diff --git a/launcher/core/include/assetupdater.h b/launcher/core/include/assetupdater.h
index e4a523f..e9721c6 100644
--- a/launcher/core/include/assetupdater.h
+++ b/launcher/core/include/assetupdater.h
@@ -14,7 +14,7 @@ struct ProfileSettings;
 class AssetUpdater : public QObject {
     Q_OBJECT
 public:
-    AssetUpdater(LauncherCore& launcher);
+    explicit AssetUpdater(LauncherCore& launcher);
 
     void update(const ProfileSettings& profile);
     void beginInstall();
diff --git a/launcher/core/include/encryptedarg.h b/launcher/core/include/encryptedarg.h
index 80f607b..1aeca14 100644
--- a/launcher/core/include/encryptedarg.h
+++ b/launcher/core/include/encryptedarg.h
@@ -13,7 +13,7 @@ inline char GetChecksum(unsigned int key) {
 
 uint32_t TickCount();
 
-inline QString encryptGameArg(QString arg) {
+inline QString encryptGameArg(const QString& arg) {
     unsigned int rawTicks = TickCount();
     unsigned int ticks = rawTicks & 0xFFFFFFFFu;
     unsigned int key = ticks & 0xFFFF0000u;
diff --git a/launcher/core/include/gameinstaller.h b/launcher/core/include/gameinstaller.h
index 63003f7..5ab997d 100644
--- a/launcher/core/include/gameinstaller.h
+++ b/launcher/core/include/gameinstaller.h
@@ -7,4 +7,4 @@ class LauncherCore;
 class ProfileSettings;
 
 // TODO: convert to a nice signal/slots class like assetupdater
-void installGame(LauncherCore& launcher, ProfileSettings& profile, std::function<void()> returnFunc);
\ No newline at end of file
+void installGame(LauncherCore& launcher, ProfileSettings& profile, const std::function<void()>& returnFunc);
\ No newline at end of file
diff --git a/launcher/core/include/headline.h b/launcher/core/include/headline.h
index a889683..b8bbec5 100644
--- a/launcher/core/include/headline.h
+++ b/launcher/core/include/headline.h
@@ -28,4 +28,4 @@ struct Headline {
 
 class LauncherCore;
 
-void getHeadline(LauncherCore& core, std::function<void(Headline)> return_func);
\ No newline at end of file
+void getHeadline(LauncherCore& core, const std::function<void(Headline)>& return_func);
\ No newline at end of file
diff --git a/launcher/core/include/launchercore.h b/launcher/core/include/launchercore.h
index e35606a..0d9c7d3 100755
--- a/launcher/core/include/launchercore.h
+++ b/launcher/core/include/launchercore.h
@@ -148,10 +148,10 @@ public:
         return profileSettings[index];
     }
 
-    int getProfileIndex(QString name);
+    int getProfileIndex(const QString& name);
     Q_INVOKABLE QList<QString> profileList() const;
     int addProfile();
-    int deleteProfile(QString name);
+    int deleteProfile(const QString& name);
 
     /*
      * Begins the login process, and may call SquareBoot or SapphireLauncher depending on the profile type.
@@ -181,7 +181,7 @@ public:
     void launchExecutable(
         const ProfileSettings& settings,
         QProcess* process,
-        QStringList args,
+        const QStringList& args,
         bool isGame,
         bool needsRegistrySetup);
 
@@ -242,7 +242,7 @@ private:
      */
     QString getGameArgs(const ProfileSettings& profile, const LoginAuth& auth);
 
-    bool checkIfInPath(QString program);
+    bool checkIfInPath(const QString& program);
     void readGameData(ProfileSettings& profile);
 
     QString getDefaultGamePath();
diff --git a/launcher/core/include/patcher.h b/launcher/core/include/patcher.h
index 021aea4..777d0f1 100644
--- a/launcher/core/include/patcher.h
+++ b/launcher/core/include/patcher.h
@@ -29,7 +29,7 @@ private:
         QString name, repository, version, path;
     };
 
-    void processPatch(QueuedPatch patch);
+    void processPatch(const QueuedPatch& patch);
 
     QVector<QueuedPatch> patchQueue;
 
diff --git a/launcher/core/include/sapphirelauncher.h b/launcher/core/include/sapphirelauncher.h
index 4fed69d..76345c6 100644
--- a/launcher/core/include/sapphirelauncher.h
+++ b/launcher/core/include/sapphirelauncher.h
@@ -6,10 +6,10 @@
 
 class SapphireLauncher : QObject {
 public:
-    SapphireLauncher(LauncherCore& window);
+    explicit SapphireLauncher(LauncherCore& window);
 
-    void login(QString lobbyUrl, const LoginInformation& info);
-    void registerAccount(QString lobbyUrl, const LoginInformation& info);
+    void login(const QString& lobbyUrl, const LoginInformation& info);
+    void registerAccount(const QString& lobbyUrl, const LoginInformation& info);
 
 private:
     LauncherCore& window;
diff --git a/launcher/core/include/squarelauncher.h b/launcher/core/include/squarelauncher.h
index 053695f..50e2b95 100644
--- a/launcher/core/include/squarelauncher.h
+++ b/launcher/core/include/squarelauncher.h
@@ -6,7 +6,7 @@
 class SquareLauncher : public QObject {
     Q_OBJECT
 public:
-    SquareLauncher(LauncherCore& window);
+    explicit SquareLauncher(LauncherCore& window);
 
     void getStored(const LoginInformation& info);
 
diff --git a/launcher/core/src/assetupdater.cpp b/launcher/core/src/assetupdater.cpp
index 97385a3..8521d36 100644
--- a/launcher/core/src/assetupdater.cpp
+++ b/launcher/core/src/assetupdater.cpp
@@ -309,7 +309,7 @@ void AssetUpdater::checkIfCheckingIsDone() {
                     const QList<QString> dirPath = fileName.left(fileName.lastIndexOf("/")).split('/');
 
                     QString build = dataDir + "/DalamudAssets/";
-                    for (auto dir : dirPath) {
+                    for (const auto& dir : dirPath) {
                         if (!QDir().exists(build + dir))
                             QDir().mkdir(build + dir);
 
diff --git a/launcher/core/src/encryptedarg.cpp b/launcher/core/src/encryptedarg.cpp
index dfef2d0..55dbff4 100644
--- a/launcher/core/src/encryptedarg.cpp
+++ b/launcher/core/src/encryptedarg.cpp
@@ -25,7 +25,7 @@ uint32_t TickCount() {
 
 #if defined(Q_OS_LINUX)
 uint32_t TickCount() {
-    struct timespec ts;
+    struct timespec ts{};
 
     clock_gettime(CLOCK_MONOTONIC, &ts);
 
diff --git a/launcher/core/src/gameinstaller.cpp b/launcher/core/src/gameinstaller.cpp
index 964f779..8084593 100644
--- a/launcher/core/src/gameinstaller.cpp
+++ b/launcher/core/src/gameinstaller.cpp
@@ -7,7 +7,7 @@
 
 #include "launchercore.h"
 
-void installGame(LauncherCore& launcher, ProfileSettings& profile, std::function<void()> returnFunc) {
+void installGame(LauncherCore& launcher, ProfileSettings& profile, const std::function<void()>& returnFunc) {
     QString installDirectory = profile.gamePath;
     qDebug() << "Installing game to " << installDirectory << "!";
 
@@ -16,7 +16,7 @@ void installGame(LauncherCore& launcher, ProfileSettings& profile, std::function
     QNetworkRequest request(QUrl("https://gdl.square-enix.com/ffxiv/inst/ffxivsetup.exe"));
 
     auto reply = launcher.mgr->get(request);
-    launcher.connect(reply, &QNetworkReply::finished, [reply, installDirectory, returnFunc] {
+    QObject::connect(reply, &QNetworkReply::finished, [reply, installDirectory, returnFunc] {
         QString dataDir = QStandardPaths::writableLocation(QStandardPaths::TempLocation);
 
         QFile file(dataDir + "/ffxivsetup.exe");
diff --git a/launcher/core/src/headline.cpp b/launcher/core/src/headline.cpp
index 12d4c6f..d8ee222 100644
--- a/launcher/core/src/headline.cpp
+++ b/launcher/core/src/headline.cpp
@@ -9,7 +9,7 @@
 
 #include "launchercore.h"
 
-void getHeadline(LauncherCore& core, std::function<void(Headline)> return_func) {
+void getHeadline(LauncherCore& core, const std::function<void(Headline)>& return_func) {
     QUrlQuery query;
     query.addQueryItem("lang", "en-us");
     query.addQueryItem("media", "pcapp");
diff --git a/launcher/core/src/launchercore.cpp b/launcher/core/src/launchercore.cpp
index ab278a6..a88b655 100755
--- a/launcher/core/src/launchercore.cpp
+++ b/launcher/core/src/launchercore.cpp
@@ -1,4 +1,3 @@
-#include <QCheckBox>
 #include <QComboBox>
 #include <QCoreApplication>
 #include <QDir>
@@ -7,17 +6,12 @@
 #include <QJsonObject>
 #include <QLineEdit>
 #include <QMenuBar>
-#include <QMessageBox>
 #include <QNetworkAccessManager>
-#include <QNetworkReply>
 #include <QProcess>
 #include <QPushButton>
-#include <QRegularExpression>
-#include <QRegularExpressionMatch>
 #include <QStandardPaths>
-#include <QTcpServer>
-#include <QUrlQuery>
 #include <algorithm>
+#include <utility>
 #include <keychain.h>
 #include <cotp.h>
 
@@ -179,7 +173,7 @@ QString LauncherCore::getGameArgs(const ProfileSettings& profile, const LoginAut
 void LauncherCore::launchExecutable(
     const ProfileSettings& profile,
     QProcess* process,
-    const QStringList args,
+    const QStringList& args,
     bool isGame,
     bool needsRegistrySetup) {
     QList<QString> arguments;
@@ -482,7 +476,7 @@ ProfileSettings& LauncherCore::getProfile(int index) {
     return *profileSettings[index];
 }
 
-int LauncherCore::getProfileIndex(QString name) {
+int LauncherCore::getProfileIndex(const QString& name) {
     for (int i = 0; i < profileSettings.size(); i++) {
         if (profileSettings[i]->name == name)
             return i;
@@ -501,7 +495,7 @@ QList<QString> LauncherCore::profileList() const {
 }
 
 int LauncherCore::addProfile() {
-    ProfileSettings* newProfile = new ProfileSettings();
+    auto newProfile = new ProfileSettings();
     newProfile->uuid = QUuid::createUuid();
     newProfile->name = "New Profile";
 
@@ -517,7 +511,7 @@ int LauncherCore::addProfile() {
     return profileSettings.size() - 1;
 }
 
-int LauncherCore::deleteProfile(QString name) {
+int LauncherCore::deleteProfile(const QString& name) {
     int index = 0;
     for (int i = 0; i < profileSettings.size(); i++) {
         if (profileSettings[i]->name == name)
@@ -589,7 +583,7 @@ void LauncherCore::saveSettings() {
     }
 }
 
-bool LauncherCore::checkIfInPath(const QString program) {
+bool LauncherCore::checkIfInPath(const QString& program) {
     // TODO: also check /usr/local/bin, /bin32 etc (basically read $PATH)
     const QString directory = "/usr/bin";
 
@@ -629,7 +623,7 @@ QString LauncherCore::getDefaultGamePath() {
 void LauncherCore::addRegistryKey(const ProfileSettings& settings, QString key, QString value, QString data) {
     auto process = new QProcess(this);
     process->setProcessEnvironment(QProcessEnvironment::systemEnvironment());
-    launchExecutable(settings, process, {"reg", "add", key, "/v", value, "/d", data, "/f"}, false, false);
+    launchExecutable(settings, process, {"reg", "add", std::move(key), "/v", value, "/d", data, "/f"}, false, false);
 }
 
 void LauncherCore::readGameData(ProfileSettings& profile) {
diff --git a/launcher/core/src/patcher.cpp b/launcher/core/src/patcher.cpp
index 83bd6f3..3159870 100644
--- a/launcher/core/src/patcher.cpp
+++ b/launcher/core/src/patcher.cpp
@@ -105,7 +105,7 @@ void Patcher::processPatchList(QNetworkAccessManager& mgr, QString patchList) {
 
 void Patcher::checkIfDone() {
     if (remainingPatches <= 0) {
-        for (auto patch : patchQueue) {
+        for (const auto& patch : patchQueue) {
             processPatch(patch);
         }
 
@@ -117,7 +117,7 @@ void Patcher::checkIfDone() {
     }
 }
 
-void Patcher::processPatch(QueuedPatch patch) {
+void Patcher::processPatch(const QueuedPatch& patch) {
     if (isBoot()) {
         physis_bootdata_apply_patch(boot_data, patch.path.toStdString().c_str());
     } else {
diff --git a/launcher/core/src/sapphirelauncher.cpp b/launcher/core/src/sapphirelauncher.cpp
index 25fc92e..f6ed125 100644
--- a/launcher/core/src/sapphirelauncher.cpp
+++ b/launcher/core/src/sapphirelauncher.cpp
@@ -7,7 +7,7 @@
 
 SapphireLauncher::SapphireLauncher(LauncherCore& window) : window(window), QObject(&window) {}
 
-void SapphireLauncher::login(QString lobbyUrl, const LoginInformation& info) {
+void SapphireLauncher::login(const QString& lobbyUrl, const LoginInformation& info) {
     QJsonObject data{{"username", info.username}, {"pass", info.password}};
 
     QUrl url;
@@ -37,7 +37,7 @@ void SapphireLauncher::login(QString lobbyUrl, const LoginInformation& info) {
     });
 }
 
-void SapphireLauncher::registerAccount(QString lobbyUrl, const LoginInformation& info) {
+void SapphireLauncher::registerAccount(const QString& lobbyUrl, const LoginInformation& info) {
     QJsonObject data{{"username", info.username}, {"pass", info.password}};
     QUrl url;
     url.setScheme("http");
diff --git a/launcher/core/src/squareboot.cpp b/launcher/core/src/squareboot.cpp
index 0e7cc73..a13f0e8 100644
--- a/launcher/core/src/squareboot.cpp
+++ b/launcher/core/src/squareboot.cpp
@@ -2,7 +2,6 @@
 
 #include <QFile>
 #include <QJsonDocument>
-#include <QJsonObject>
 #include <QMessageBox>
 #include <QNetworkReply>
 #include <QPushButton>
diff --git a/launcher/desktop/include/aboutwindow.h b/launcher/desktop/include/aboutwindow.h
index 737e5a7..553c17a 100644
--- a/launcher/desktop/include/aboutwindow.h
+++ b/launcher/desktop/include/aboutwindow.h
@@ -4,5 +4,5 @@
 
 class AboutWindow : public QDialog {
 public:
-    AboutWindow(QWidget* widget = nullptr);
+    explicit AboutWindow(QWidget* widget = nullptr);
 };
\ No newline at end of file
diff --git a/launcher/desktop/include/launcherwindow.h b/launcher/desktop/include/launcherwindow.h
index 6f899e8..58cf6ab 100644
--- a/launcher/desktop/include/launcherwindow.h
+++ b/launcher/desktop/include/launcherwindow.h
@@ -19,7 +19,7 @@ public:
 
     ProfileSettings& currentProfile();
 
-    void openPath(const QString path);
+    void openPath(const QString& path);
 
 public slots:
     void reloadControls();
diff --git a/launcher/desktop/src/aboutwindow.cpp b/launcher/desktop/src/aboutwindow.cpp
index fdac03f..34bdd8f 100644
--- a/launcher/desktop/src/aboutwindow.cpp
+++ b/launcher/desktop/src/aboutwindow.cpp
@@ -35,13 +35,13 @@ AboutWindow::AboutWindow(QWidget* widget) : QDialog(widget) {
     auto licenseLabel = new QLabel();
     licenseLabel->setText("<a href='a'>License: GNU General Public License Version 3</a>");
     connect(licenseLabel, &QLabel::linkActivated, [this] {
-        QDialog* licenseDialog = new QDialog(this);
+        auto licenseDialog = new QDialog(this);
         licenseDialog->setWindowTitle("License Agreement");
 
-        QVBoxLayout* layout = new QVBoxLayout();
+        auto layout = new QVBoxLayout();
         licenseDialog->setLayout(layout);
 
-        QPlainTextEdit* licenseEdit = new QPlainTextEdit();
+        auto licenseEdit = new QPlainTextEdit();
         licenseEdit->setPlainText(license);
         licenseEdit->setReadOnly(true);
         layout->addWidget(licenseEdit);
diff --git a/launcher/desktop/src/autologinwindow.cpp b/launcher/desktop/src/autologinwindow.cpp
index 2d818bd..532f4d7 100644
--- a/launcher/desktop/src/autologinwindow.cpp
+++ b/launcher/desktop/src/autologinwindow.cpp
@@ -1,18 +1,12 @@
 #include "autologinwindow.h"
 
-#include <QCheckBox>
 #include <QDesktopServices>
-#include <QFileDialog>
 #include <QFormLayout>
-#include <QGridLayout>
-#include <QGroupBox>
 #include <QLabel>
 #include <QMessageBox>
-#include <QProcess>
 #include <QPushButton>
 #include <QSpinBox>
 #include <QToolTip>
-#include <keychain.h>
 
 #include "launchercore.h"
 #include "launcherwindow.h"
diff --git a/launcher/desktop/src/bannerwidget.cpp b/launcher/desktop/src/bannerwidget.cpp
index 58f847a..da12a38 100644
--- a/launcher/desktop/src/bannerwidget.cpp
+++ b/launcher/desktop/src/bannerwidget.cpp
@@ -12,6 +12,6 @@ void BannerWidget::mousePressEvent(QMouseEvent* event) {
     QDesktopServices::openUrl(url);
 }
 
-void BannerWidget::setUrl(QUrl url) {
-    this->url = url;
+void BannerWidget::setUrl(QUrl newUrl) {
+    this->url = newUrl;
 }
diff --git a/launcher/desktop/src/gamescopesettingswindow.cpp b/launcher/desktop/src/gamescopesettingswindow.cpp
index 350bfb7..c9a2f9a 100644
--- a/launcher/desktop/src/gamescopesettingswindow.cpp
+++ b/launcher/desktop/src/gamescopesettingswindow.cpp
@@ -2,14 +2,8 @@
 
 #include <QCheckBox>
 #include <QDesktopServices>
-#include <QFileDialog>
 #include <QFormLayout>
-#include <QGridLayout>
-#include <QGroupBox>
-#include <QLabel>
 #include <QMessageBox>
-#include <QProcess>
-#include <QPushButton>
 #include <QSpinBox>
 #include <QToolTip>
 
diff --git a/launcher/desktop/src/launcherwindow.cpp b/launcher/desktop/src/launcherwindow.cpp
index 7b24434..4233f21 100644
--- a/launcher/desktop/src/launcherwindow.cpp
+++ b/launcher/desktop/src/launcherwindow.cpp
@@ -10,18 +10,15 @@
 #include <QScrollBar>
 #include <QTimer>
 #include <QTreeWidgetItem>
-#include <keychain.h>
 
 #include "aboutwindow.h"
 #include "assetupdater.h"
 #include "bannerwidget.h"
-#include "config.h"
 #include "encryptedarg.h"
 #include "gameinstaller.h"
 #include "headline.h"
 #include "sapphirelauncher.h"
 #include "settingswindow.h"
-#include "squareboot.h"
 #include "squarelauncher.h"
 
 LauncherWindow::LauncherWindow(LauncherCore& core, QWidget* parent) : QMainWindow(parent), core(core) {
@@ -485,7 +482,7 @@ void LauncherWindow::reloadNews() {
 
         if (!headline.banner.empty()) {
             if (core.appSettings.showBanners) {
-                for (auto banner : headline.banner) {
+                for (const auto& banner : headline.banner) {
                     auto request = QNetworkRequest(banner.bannerImage);
                     core.buildRequest(currentProfile(), request);
 
@@ -524,9 +521,9 @@ void LauncherWindow::reloadNews() {
             }
 
             if (core.appSettings.showNewsList) {
-                QTreeWidgetItem* newsItem = new QTreeWidgetItem((QTreeWidgetItem*)nullptr, QStringList("News"));
-                for (auto news : headline.news) {
-                    QTreeWidgetItem* item = new QTreeWidgetItem();
+                auto newsItem = new QTreeWidgetItem((QTreeWidgetItem*)nullptr, QStringList("News"));
+                for (const auto& news : headline.news) {
+                    auto item = new QTreeWidgetItem();
                     item->setText(0, news.title);
                     item->setText(1, QLocale().toString(news.date, QLocale::ShortFormat));
                     item->setData(0, Qt::UserRole, news.url);
@@ -534,9 +531,9 @@ void LauncherWindow::reloadNews() {
                     newsItem->addChild(item);
                 }
 
-                QTreeWidgetItem* pinnedItem = new QTreeWidgetItem((QTreeWidgetItem*)nullptr, QStringList("Pinned"));
-                for (auto pinned : headline.pinned) {
-                    QTreeWidgetItem* item = new QTreeWidgetItem();
+                auto pinnedItem = new QTreeWidgetItem((QTreeWidgetItem*)nullptr, QStringList("Pinned"));
+                for (const auto& pinned : headline.pinned) {
+                    auto item = new QTreeWidgetItem();
                     item->setText(0, pinned.title);
                     item->setText(1, QLocale().toString(pinned.date, QLocale::ShortFormat));
                     item->setData(0, Qt::UserRole, pinned.url);
@@ -544,9 +541,9 @@ void LauncherWindow::reloadNews() {
                     pinnedItem->addChild(item);
                 }
 
-                QTreeWidgetItem* topicsItem = new QTreeWidgetItem((QTreeWidgetItem*)nullptr, QStringList("Topics"));
-                for (auto news : headline.topics) {
-                    QTreeWidgetItem* item = new QTreeWidgetItem();
+                auto topicsItem = new QTreeWidgetItem((QTreeWidgetItem*)nullptr, QStringList("Topics"));
+                for (const auto& news : headline.topics) {
+                    auto item = new QTreeWidgetItem();
                     item->setText(0, news.title);
                     item->setText(1, QLocale().toString(news.date, QLocale::ShortFormat));
                     item->setData(0, Qt::UserRole, news.url);
@@ -565,7 +562,7 @@ void LauncherWindow::reloadNews() {
     }
 }
 
-void LauncherWindow::openPath(const QString path) {
+void LauncherWindow::openPath(const QString& path) {
 #if defined(Q_OS_WIN)
     // for some reason, windows requires special treatment (what else is new?)
     const QFileInfo fileInfo(path);
diff --git a/launcher/desktop/src/settingswindow.cpp b/launcher/desktop/src/settingswindow.cpp
index bcf9747..1d69507 100644
--- a/launcher/desktop/src/settingswindow.cpp
+++ b/launcher/desktop/src/settingswindow.cpp
@@ -5,11 +5,9 @@
 #include <QFileDialog>
 #include <QFormLayout>
 #include <QGridLayout>
-#include <QGroupBox>
 #include <QInputDialog>
 #include <QLabel>
 #include <QMessageBox>
-#include <QProcess>
 #include <QPushButton>
 #include <QToolTip>
 #include <keychain.h>