diff --git a/app/backend/autoupdatechecker.cpp b/app/backend/autoupdatechecker.cpp
index 8c1e14d4..989a62fb 100644
--- a/app/backend/autoupdatechecker.cpp
+++ b/app/backend/autoupdatechecker.cpp
@@ -15,8 +15,8 @@ AutoUpdateChecker::AutoUpdateChecker(QObject *parent) :
     // Allow HTTP redirects
     m_Nam.setRedirectPolicy(QNetworkRequest::NoLessSafeRedirectPolicy);
 
-    connect(&m_Nam, SIGNAL(finished(QNetworkReply*)),
-            this, SLOT(handleUpdateCheckRequestFinished(QNetworkReply*)));
+    connect(&m_Nam, &QNetworkAccessManager::finished,
+            this, &AutoUpdateChecker::handleUpdateCheckRequestFinished);
 
     QString currentVersion(VERSION_STR);
     qDebug() << "Current Moonlight version:" << currentVersion;
diff --git a/app/backend/boxartmanager.cpp b/app/backend/boxartmanager.cpp
index bb474d53..62e3158b 100644
--- a/app/backend/boxartmanager.cpp
+++ b/app/backend/boxartmanager.cpp
@@ -46,8 +46,8 @@ public:
           m_Computer(computer),
           m_App(app)
     {
-        connect(this, SIGNAL(boxArtFetchCompleted(NvComputer*,NvApp,QUrl)),
-                boxArtManager, SLOT(handleBoxArtLoadComplete(NvComputer*,NvApp,QUrl)));
+        connect(this, &NetworkBoxArtLoadTask::boxArtFetchCompleted,
+                boxArtManager, &BoxArtManager::handleBoxArtLoadComplete);
     }
 
 signals:
diff --git a/app/backend/computermanager.cpp b/app/backend/computermanager.cpp
index d54c624b..77d95302 100644
--- a/app/backend/computermanager.cpp
+++ b/app/backend/computermanager.cpp
@@ -164,7 +164,7 @@ ComputerManager::ComputerManager(QObject *parent)
     // because NvHTTP uses aboutToQuit() to abort requests in progres
     // while quitting, however this is a one time signal - additional
     // requests would not be aborted and block termination.
-    connect(QCoreApplication::instance(), SIGNAL(aboutToQuit()), this, SLOT(handleAboutToQuit()));
+    connect(QCoreApplication::instance(), &QCoreApplication::aboutToQuit, this, &ComputerManager::handleAboutToQuit);
 }
 
 ComputerManager::~ComputerManager()
@@ -302,8 +302,8 @@ void ComputerManager::startPollingComputer(NvComputer* computer)
 
     if (!pollingEntry->isActive()) {
         PcMonitorThread* thread = new PcMonitorThread(computer);
-        connect(thread, SIGNAL(computerStateChanged(NvComputer*)),
-                this, SLOT(handleComputerStateChanged(NvComputer*)));
+        connect(thread, &PcMonitorThread::computerStateChanged,
+                this, &ComputerManager::handleComputerStateChanged);
         pollingEntry->setActiveThread(thread);
         thread->start();
     }
@@ -337,7 +337,6 @@ void ComputerManager::handleMdnsServiceResolved(MdnsPendingComputer* computer,
                         address.isInSubnet(QHostAddress("fec0::"), 10) ||
                         address.isInSubnet(QHostAddress("fc00::"), 7)) {
                     addNewHost(address.toString(), true, v6Global);
-                    added = true;
                     break;
                 }
             }
@@ -418,7 +417,7 @@ void ComputerManager::deleteHost(NvComputer* computer)
 void ComputerManager::renameHost(NvComputer* computer, QString name)
 {
     {
-        QWriteLocker(&computer->lock);
+        QWriteLocker lock(&computer->lock);
 
         computer->name = name;
         computer->hasCustomName = true;
diff --git a/app/backend/computermanager.h b/app/backend/computermanager.h
index 57593632..9882d299 100644
--- a/app/backend/computermanager.h
+++ b/app/backend/computermanager.h
@@ -70,7 +70,7 @@ private:
         m_Resolver = new QMdnsEngine::Resolver(m_Server, m_Hostname);
         connect(m_Resolver, &QMdnsEngine::Resolver::resolved,
                 this, &MdnsPendingComputer::handleResolvedAddress);
-        QTimer::singleShot(2000, this, SLOT(handleResolvedTimeout()));
+        QTimer::singleShot(2000, this, &MdnsPendingComputer::handleResolvedTimeout);
     }
 
     QByteArray m_Hostname;
diff --git a/app/backend/identitymanager.cpp b/app/backend/identitymanager.cpp
index 95bb9768..51ea5d90 100644
--- a/app/backend/identitymanager.cpp
+++ b/app/backend/identitymanager.cpp
@@ -143,7 +143,7 @@ QSslKey
 IdentityManager::getSslKey()
 {
     if (m_CachedSslKey.isNull()) {
-        BIO* bio = BIO_new_mem_buf(m_CachedPrivateKey.data(), -1);
+        BIO* bio = BIO_new_mem_buf(m_CachedPrivateKey.constData(), -1);
         THROW_BAD_ALLOC_IF_NULL(bio);
 
         EVP_PKEY* pk = PEM_read_bio_PrivateKey(bio, nullptr, nullptr, nullptr);
diff --git a/app/backend/nvcomputer.cpp b/app/backend/nvcomputer.cpp
index 9bd37bbe..f3180912 100644
--- a/app/backend/nvcomputer.cpp
+++ b/app/backend/nvcomputer.cpp
@@ -30,6 +30,7 @@ NvComputer::NvComputer(QSettings& settings)
     this->serverCert = QSslCertificate(settings.value(SER_SRVCERT).toByteArray());
 
     int appCount = settings.beginReadArray(SER_APPLIST);
+    this->appList.reserve(appCount);
     for (int i = 0; i < appCount; i++) {
         settings.setArrayIndex(i);
 
@@ -98,7 +99,7 @@ NvComputer::NvComputer(QString address, QString serverInfo, QSslCertificate serv
     QString newMacString = NvHTTP::getXmlString(serverInfo, "mac");
     if (newMacString != "00:00:00:00:00:00") {
         QStringList macOctets = newMacString.split(':');
-        for (QString macOctet : macOctets) {
+        for (const QString& macOctet : macOctets) {
             this->macAddress.append((char) macOctet.toInt(nullptr, 16));
         }
     }
diff --git a/app/backend/nvhttp.cpp b/app/backend/nvhttp.cpp
index 3826a298..8be5b88e 100644
--- a/app/backend/nvhttp.cpp
+++ b/app/backend/nvhttp.cpp
@@ -67,7 +67,8 @@ NvHTTP::parseQuad(QString quad)
     }
 
     QStringList parts = quad.split(".");
-    for (int i = 0; i < 4; i++)
+    ret.reserve(parts.length());
+    for (int i = 0; i < parts.length(); i++)
     {
         ret.append(parts.at(i).toInt());
     }
@@ -391,7 +392,7 @@ void NvHTTP::handleSslErrors(QNetworkReply* reply, const QList<QSslError>& error
         return;
     }
 
-    for (auto error : errors) {
+    for (const QSslError& error : errors) {
         if (m_ServerCert != error.certificate()) {
             ignoreErrors = false;
             break;
@@ -462,10 +463,10 @@ NvHTTP::openConnection(QUrl baseUrl,
 
     // Run the request with a timeout if requested
     QEventLoop loop;
-    connect(reply, SIGNAL(finished()), &loop, SLOT(quit()));
-    connect(QCoreApplication::instance(), SIGNAL(aboutToQuit()), &loop, SLOT(quit()));
+    connect(reply, &QNetworkReply::finished, &loop, &QEventLoop::quit);
+    connect(QCoreApplication::instance(), &QCoreApplication::aboutToQuit, &loop, &QEventLoop::quit);
     if (timeoutMs) {
-        QTimer::singleShot(timeoutMs, &loop, SLOT(quit()));
+        QTimer::singleShot(timeoutMs, &loop, &QEventLoop::quit);
     }
     if (logLevel >= NvLogLevel::NVLL_VERBOSE) {
         qInfo() << "Executing request:" << url.toString();
diff --git a/app/backend/nvhttp.h b/app/backend/nvhttp.h
index 69041497..26c49b7c 100644
--- a/app/backend/nvhttp.h
+++ b/app/backend/nvhttp.h
@@ -23,6 +23,7 @@ public:
     int height;
     int refreshRate;
 };
+Q_DECLARE_TYPEINFO(NvDisplayMode, Q_PRIMITIVE_TYPE);
 
 class GfeHttpResponseException : public std::exception
 {
diff --git a/app/backend/nvpairingmanager.cpp b/app/backend/nvpairingmanager.cpp
index eba7e1f0..6053e8be 100644
--- a/app/backend/nvpairingmanager.cpp
+++ b/app/backend/nvpairingmanager.cpp
@@ -215,7 +215,7 @@ NvPairingManager::pair(QString appVersion, QString pin, QSslCertificate& serverC
     QByteArray salt = generateRandomBytes(16);
     QByteArray saltedPin = saltPin(salt, pin);
 
-    QByteArray aesKey = QCryptographicHash::hash(saltedPin, hashAlgo).data();
+    QByteArray aesKey = QCryptographicHash::hash(saltedPin, hashAlgo).constData();
     aesKey.truncate(16);
 
     QString getCert = m_Http.openConnectionToString(m_Http.m_BaseUrlHttp,
diff --git a/app/cli/commandlineparser.cpp b/app/cli/commandlineparser.cpp
index 220858c0..aa7af24c 100644
--- a/app/cli/commandlineparser.cpp
+++ b/app/cli/commandlineparser.cpp
@@ -52,7 +52,7 @@ public:
 
     void handleUnknownOptions()
     {
-        if (unknownOptionNames().length()) {
+        if (!unknownOptionNames().isEmpty()) {
             showError(QString("Unknown options: %1").arg(unknownOptionNames().join(", ")));
         }
     }
@@ -325,25 +325,21 @@ void StreamCommandLineParser::parse(const QStringList &args, StreamingPreference
     // Resolve display's width and height
     QRegularExpression resolutionRexExp("^(720|1080|1440|4K|resolution)$");
     QStringList resoOptions = parser.optionNames().filter(resolutionRexExp);
-    bool displaySet = resoOptions.length();
+    bool displaySet = !resoOptions.isEmpty();
     if (displaySet) {
         QString name = resoOptions.last();
         if (name == "720") {
             preferences->width  = 1280;
             preferences->height = 720;
-            displaySet = true;
         } else if (name == "1080") {
             preferences->width  = 1920;
             preferences->height = 1080;
-            displaySet = true;
         } else if (name == "1440") {
             preferences->width  = 2560;
             preferences->height = 1440;
-            displaySet = true;
         } else if (name == "4K") {
             preferences->width  = 3840;
             preferences->height = 2160;
-            displaySet = true;
         } else if (name == "resolution") {
             auto resolution = parser.getResolutionOptionValue(name);
             preferences->width  = resolution.first;
diff --git a/app/gui/sdlgamepadkeynavigation.cpp b/app/gui/sdlgamepadkeynavigation.cpp
index 006032b7..4e9f1952 100644
--- a/app/gui/sdlgamepadkeynavigation.cpp
+++ b/app/gui/sdlgamepadkeynavigation.cpp
@@ -15,7 +15,7 @@ SdlGamepadKeyNavigation::SdlGamepadKeyNavigation()
       m_LastAxisNavigationEventTime(0)
 {
     m_PollingTimer = new QTimer(this);
-    connect(m_PollingTimer, SIGNAL(timeout()), this, SLOT(onPollingTimerFired()));
+    connect(m_PollingTimer, &QTimer::timeout, this, &SdlGamepadKeyNavigation::onPollingTimerFired);
 }
 
 SdlGamepadKeyNavigation::~SdlGamepadKeyNavigation()
diff --git a/app/settings/mappingfetcher.cpp b/app/settings/mappingfetcher.cpp
index f70a7981..8e59fcae 100644
--- a/app/settings/mappingfetcher.cpp
+++ b/app/settings/mappingfetcher.cpp
@@ -13,8 +13,8 @@ MappingFetcher::MappingFetcher(QObject *parent) :
     // Allow HTTP redirects
     m_Nam.setRedirectPolicy(QNetworkRequest::NoLessSafeRedirectPolicy);
 
-    connect(&m_Nam, SIGNAL(finished(QNetworkReply*)),
-            this, SLOT(handleMappingListFetched(QNetworkReply*)));
+    connect(&m_Nam, &QNetworkAccessManager::finished,
+            this, &MappingFetcher::handleMappingListFetched);
 }
 
 void MappingFetcher::start()
diff --git a/app/settings/mappingmanager.cpp b/app/settings/mappingmanager.cpp
index e9a4bf6e..be9a1a8d 100644
--- a/app/settings/mappingmanager.cpp
+++ b/app/settings/mappingmanager.cpp
@@ -41,7 +41,7 @@ MappingManager::MappingManager()
         #else
             .split('\n', QString::SkipEmptyParts);
         #endif
-    for (QString sdlMapping : sdlMappings) {
+    for (const QString& sdlMapping : sdlMappings) {
         SdlGamepadMapping mapping(sdlMapping);
         addMapping(mapping);
     }
diff --git a/app/streaming/video/ffmpeg-renderers/vt.mm b/app/streaming/video/ffmpeg-renderers/vt.mm
index 140e7a9b..39b54dc0 100644
--- a/app/streaming/video/ffmpeg-renderers/vt.mm
+++ b/app/streaming/video/ffmpeg-renderers/vt.mm
@@ -281,8 +281,8 @@ public:
         // Queue this sample for the next v-sync
         CMSampleTimingInfo timingInfo = {
             .duration = kCMTimeInvalid,
+            .presentationTimeStamp = CMClockMakeHostTimeFromSystemUnits(mach_absolute_time()),
             .decodeTimeStamp = kCMTimeInvalid,
-            .presentationTimeStamp = CMClockMakeHostTimeFromSystemUnits(mach_absolute_time())
         };
 
         CMSampleBufferRef sampleBuffer;
@@ -365,6 +365,7 @@ public:
                                 if ([device.name containsString:@" 5"]) {
                                     SDL_LogWarn(SDL_LOG_CATEGORY_APPLICATION,
                                                 "No HEVC Main10 support on Skylake iGPU");
+                                    [device release];
                                     return false;
                                 }
                             }
@@ -375,10 +376,13 @@ public:
                                         [device.name containsString:@" M3"]) {
                                     SDL_LogWarn(SDL_LOG_CATEGORY_APPLICATION,
                                                 "No HEVC Main10 support on AMD GPUs until Polaris");
+                                    [device release];
                                     return false;
                                 }
                             }
                         }
+
+                        [device release];
                     }
                     else
             #endif