diff --git a/src/base/bittorrent/session.cpp b/src/base/bittorrent/session.cpp
index af7188339..f4d404444 100644
--- a/src/base/bittorrent/session.cpp
+++ b/src/base/bittorrent/session.cpp
@@ -635,7 +635,7 @@ Path Session::downloadPath() const
 
 bool Session::isValidCategoryName(const QString &name)
 {
-    static const QRegularExpression re(uR"(^([^\\\/]|[^\\\/]([^\\\/]|\/(?=[^\/]))*[^\\\/])$)"_qs);
+    const QRegularExpression re(uR"(^([^\\\/]|[^\\\/]([^\\\/]|\/(?=[^\/]))*[^\\\/])$)"_qs);
     if (!name.isEmpty() && (name.indexOf(re) != 0))
     {
         qDebug() << "Incorrect category name:" << name;
diff --git a/src/base/bittorrent/statistics.cpp b/src/base/bittorrent/statistics.cpp
index 0af93c9c4..142833155 100644
--- a/src/base/bittorrent/statistics.cpp
+++ b/src/base/bittorrent/statistics.cpp
@@ -35,7 +35,7 @@
 #include "base/bittorrent/sessionstatus.h"
 #include "base/profile.h"
 
-static const qint64 SAVE_INTERVAL = 15 * 60 * 1000;
+const qint64 SAVE_INTERVAL = 15 * 60 * 1000;
 
 using namespace BitTorrent;
 
diff --git a/src/base/rss/rss_item.cpp b/src/base/rss/rss_item.cpp
index 2179b3a22..05fe8677e 100644
--- a/src/base/rss/rss_item.cpp
+++ b/src/base/rss/rss_item.cpp
@@ -68,7 +68,7 @@ QString Item::name() const
 
 bool Item::isValidPath(const QString &path)
 {
-    static const QRegularExpression re(
+    const QRegularExpression re(
                 uR"(\A[^\%1]+(\%1[^\%1]+)*\z)"_qs.arg(Item::PathSeparator)
                 , QRegularExpression::DontCaptureOption);
 
diff --git a/src/base/torrentfileguard.cpp b/src/base/torrentfileguard.cpp
index 3ea4eb085..9c398b365 100644
--- a/src/base/torrentfileguard.cpp
+++ b/src/base/torrentfileguard.cpp
@@ -31,6 +31,14 @@
 #include "settingvalue.h"
 #include "utils/fs.h"
 
+namespace
+{
+    SettingValue<TorrentFileGuard::AutoDeleteMode> autoDeleteModeSetting()
+    {
+        return SettingValue<TorrentFileGuard::AutoDeleteMode> {u"Core/AutoDeleteAddedTorrentFile"_qs};
+    }
+}
+
 FileGuard::FileGuard(const Path &path)
     : m_path {path}
     , m_remove {true}
@@ -76,13 +84,7 @@ TorrentFileGuard::AutoDeleteMode TorrentFileGuard::autoDeleteMode()
     return autoDeleteModeSetting().get(AutoDeleteMode::Never);
 }
 
-void TorrentFileGuard::setAutoDeleteMode(TorrentFileGuard::AutoDeleteMode mode)
+void TorrentFileGuard::setAutoDeleteMode(const TorrentFileGuard::AutoDeleteMode mode)
 {
     autoDeleteModeSetting() = mode;
 }
-
-SettingValue<TorrentFileGuard::AutoDeleteMode> &TorrentFileGuard::autoDeleteModeSetting()
-{
-    static SettingValue<AutoDeleteMode> setting {u"Core/AutoDeleteAddedTorrentFile"_qs};
-    return setting;
-}
diff --git a/src/base/torrentfileguard.h b/src/base/torrentfileguard.h
index 3da84d658..83e015995 100644
--- a/src/base/torrentfileguard.h
+++ b/src/base/torrentfileguard.h
@@ -33,8 +33,6 @@
 
 #include "base/path.h"
 
-template <typename T> class SettingValue;
-
 /// Utility class to defer file deletion
 class FileGuard
 {
@@ -47,7 +45,7 @@ public:
 
 private:
     Path m_path;
-    bool m_remove;
+    bool m_remove = false;
 };
 
 /// Reads settings for .torrent files from preferences
@@ -64,7 +62,7 @@ public:
     void markAsAddedToSession();
     using FileGuard::setAutoRemove;
 
-    enum AutoDeleteMode: int     // do not change these names: they are stored in config file
+    enum AutoDeleteMode : int     // do not change these names: they are stored in config file
     {
         Never,
         IfAdded,
@@ -77,9 +75,8 @@ public:
 
 private:
     TorrentFileGuard(const Path &path, AutoDeleteMode mode);
-    static SettingValue<AutoDeleteMode> &autoDeleteModeSetting();
 
     Q_ENUM(AutoDeleteMode)
     AutoDeleteMode m_mode;
-    bool m_wasAdded;
+    bool m_wasAdded = false;
 };
diff --git a/src/base/utils/misc.cpp b/src/base/utils/misc.cpp
index f02ec106d..01d81e178 100644
--- a/src/base/utils/misc.cpp
+++ b/src/base/utils/misc.cpp
@@ -457,7 +457,7 @@ QString Utils::Misc::parseHtmlLinks(const QString &rawText)
     result.replace(reURL, u"\\1<a href=\"\\2\">\\2</a>"_qs);
 
     // Capture links without scheme
-    static const QRegularExpression reNoScheme(u"<a\\s+href=\"(?!https?)([a-zA-Z0-9\\?%=&/_\\.-:#]+)\\s*\">"_qs);
+    const QRegularExpression reNoScheme(u"<a\\s+href=\"(?!https?)([a-zA-Z0-9\\?%=&/_\\.-:#]+)\\s*\">"_qs);
     result.replace(reNoScheme, u"<a href=\"http://\\1\">"_qs);
 
     // to preserve plain text formatting
diff --git a/src/gui/search/searchjobwidget.cpp b/src/gui/search/searchjobwidget.cpp
index 8ef1551bf..afe7623c5 100644
--- a/src/gui/search/searchjobwidget.cpp
+++ b/src/gui/search/searchjobwidget.cpp
@@ -44,7 +44,6 @@
 #include "base/search/searchdownloadhandler.h"
 #include "base/search/searchhandler.h"
 #include "base/search/searchpluginmanager.h"
-#include "base/settingvalue.h"
 #include "base/utils/misc.h"
 #include "gui/addnewtorrentdialog.h"
 #include "gui/lineedit.h"
@@ -57,6 +56,7 @@ SearchJobWidget::SearchJobWidget(SearchHandler *searchHandler, QWidget *parent)
     : QWidget(parent)
     , m_ui(new Ui::SearchJobWidget)
     , m_searchHandler(searchHandler)
+    , m_nameFilteringMode(u"Search/FilteringMode"_qs)
 {
     m_ui->setupUi(this);
 
@@ -319,7 +319,7 @@ void SearchJobWidget::updateFilter()
         sizeInBytes(m_ui->minSize->value(), static_cast<SizeUnit>(m_ui->minSizeUnit->currentIndex())),
         sizeInBytes(m_ui->maxSize->value(), static_cast<SizeUnit>(m_ui->maxSizeUnit->currentIndex())));
 
-    nameFilteringModeSetting() = filteringMode();
+    m_nameFilteringMode = filteringMode();
 
     m_proxyModel->invalidate();
     updateResultsCount();
@@ -355,8 +355,8 @@ void SearchJobWidget::fillFilterComboBoxes()
     m_ui->filterMode->addItem(tr("Torrent names only"), static_cast<int>(NameFilteringMode::OnlyNames));
     m_ui->filterMode->addItem(tr("Everywhere"), static_cast<int>(NameFilteringMode::Everywhere));
 
-    QVariant selectedMode = static_cast<int>(nameFilteringModeSetting().get(NameFilteringMode::OnlyNames));
-    int index = m_ui->filterMode->findData(selectedMode);
+    const QVariant selectedMode = static_cast<int>(m_nameFilteringMode.get(NameFilteringMode::OnlyNames));
+    const int index = m_ui->filterMode->findData(selectedMode);
     m_ui->filterMode->setCurrentIndex((index == -1) ? 0 : index);
 }
 
@@ -545,12 +545,6 @@ void SearchJobWidget::appendSearchResults(const QVector<SearchResult> &results)
     updateResultsCount();
 }
 
-SettingValue<SearchJobWidget::NameFilteringMode> &SearchJobWidget::nameFilteringModeSetting()
-{
-    static SettingValue<NameFilteringMode> setting {u"Search/FilteringMode"_qs};
-    return setting;
-}
-
 void SearchJobWidget::keyPressEvent(QKeyEvent *event)
 {
     switch (event->key())
diff --git a/src/gui/search/searchjobwidget.h b/src/gui/search/searchjobwidget.h
index 61052168d..e4818a5df 100644
--- a/src/gui/search/searchjobwidget.h
+++ b/src/gui/search/searchjobwidget.h
@@ -31,6 +31,8 @@
 
 #include <QWidget>
 
+#include "base/settingvalue.h"
+
 #define ENGINE_URL_COLUMN 4
 #define URL_COLUMN 5
 
@@ -127,7 +129,6 @@ private:
     void copyField(int column) const;
 
     static QString statusText(Status st);
-    static SettingValue<NameFilteringMode> &nameFilteringModeSetting();
 
     Ui::SearchJobWidget *m_ui;
     SearchHandler *m_searchHandler;
@@ -136,6 +137,8 @@ private:
     LineEdit *m_lineEditSearchResultsFilter;
     Status m_status = Status::Ongoing;
     bool m_noSearchResults = true;
+
+    SettingValue<NameFilteringMode> m_nameFilteringMode;
 };
 
 Q_DECLARE_METATYPE(SearchJobWidget::NameFilteringMode)
diff --git a/src/gui/torrentcontentmodel.cpp b/src/gui/torrentcontentmodel.cpp
index 17898bcfc..1064029c7 100644
--- a/src/gui/torrentcontentmodel.cpp
+++ b/src/gui/torrentcontentmodel.cpp
@@ -69,14 +69,20 @@ namespace
     class UnifiedFileIconProvider : public QFileIconProvider
     {
     public:
+        UnifiedFileIconProvider()
+            : m_textPlainIcon {UIThemeManager::instance()->getIcon(u"text-plain"_qs)}
+        {
+        }
+
         using QFileIconProvider::icon;
 
-        QIcon icon(const QFileInfo &info) const override
+        QIcon icon(const QFileInfo &) const override
         {
-            Q_UNUSED(info);
-            static QIcon cached = UIThemeManager::instance()->getIcon(u"text-plain"_qs);
-            return cached;
+            return m_textPlainIcon;
         }
+
+    private:
+        QIcon m_textPlainIcon;
     };
 
 #ifdef QBT_PIXMAP_CACHE_FOR_FILE_ICONS
@@ -185,15 +191,14 @@ namespace
 TorrentContentModel::TorrentContentModel(QObject *parent)
     : QAbstractItemModel(parent)
     , m_rootItem(new TorrentContentModelFolder(QVector<QString>({ tr("Name"), tr("Total Size"), tr("Progress"), tr("Download Priority"), tr("Remaining"), tr("Availability") })))
-{
 #if defined(Q_OS_WIN)
-    m_fileIconProvider = new WinShellFileIconProvider();
+    , m_fileIconProvider {new WinShellFileIconProvider}
 #elif defined(Q_OS_MACOS)
-    m_fileIconProvider = new MacFileIconProvider();
+    , m_fileIconProvider {new MacFileIconProvider}
 #else
-    static bool doesBuiltInProviderWork = doesQFileIconProviderWork();
-    m_fileIconProvider = doesBuiltInProviderWork ? new QFileIconProvider() : new MimeFileIconProvider();
+    , m_fileIconProvider {doesQFileIconProviderWork() ? new QFileIconProvider : new MimeFileIconProvider}
 #endif
+{
 }
 
 TorrentContentModel::~TorrentContentModel()
diff --git a/src/gui/torrentcontentmodel.h b/src/gui/torrentcontentmodel.h
index 10764957a..a1baf0666 100644
--- a/src/gui/torrentcontentmodel.h
+++ b/src/gui/torrentcontentmodel.h
@@ -84,7 +84,7 @@ public slots:
     void selectNone();
 
 private:
-    TorrentContentModelFolder *m_rootItem;
+    TorrentContentModelFolder *m_rootItem = nullptr;
     QVector<TorrentContentModelFile *> m_filesIndex;
-    QFileIconProvider *m_fileIconProvider;
+    QFileIconProvider *m_fileIconProvider = nullptr;
 };
diff --git a/src/gui/transferlistdelegate.cpp b/src/gui/transferlistdelegate.cpp
index b649ecff1..dc21654d7 100644
--- a/src/gui/transferlistdelegate.cpp
+++ b/src/gui/transferlistdelegate.cpp
@@ -50,15 +50,14 @@ QSize TransferListDelegate::sizeHint(const QStyleOptionViewItem &option, const Q
     // the rows shrink if the text's height is smaller than the icon's height.
     // This happens because icon from the 'name' column is no longer drawn.
 
-    static int nameColHeight = -1;
-    if (nameColHeight == -1)
+    if (m_nameColHeight == -1)
     {
         const QModelIndex nameColumn = index.sibling(index.row(), TransferListModel::TR_NAME);
-        nameColHeight = QStyledItemDelegate::sizeHint(option, nameColumn).height();
+        m_nameColHeight = QStyledItemDelegate::sizeHint(option, nameColumn).height();
     }
 
     QSize size = QStyledItemDelegate::sizeHint(option, index);
-    size.setHeight(std::max(nameColHeight, size.height()));
+    size.setHeight(std::max(m_nameColHeight, size.height()));
     return size;
 }
 
diff --git a/src/gui/transferlistdelegate.h b/src/gui/transferlistdelegate.h
index 1c912db34..01194d118 100644
--- a/src/gui/transferlistdelegate.h
+++ b/src/gui/transferlistdelegate.h
@@ -46,4 +46,5 @@ public:
 
 private:
     ProgressBarPainter m_progressBarPainter;
+    mutable int m_nameColHeight = -1;
 };
diff --git a/src/gui/transferlistmodel.cpp b/src/gui/transferlistmodel.cpp
index 2fab81906..ee0f75136 100644
--- a/src/gui/transferlistmodel.cpp
+++ b/src/gui/transferlistmodel.cpp
@@ -32,7 +32,6 @@
 #include <QApplication>
 #include <QDateTime>
 #include <QDebug>
-#include <QIcon>
 #include <QPalette>
 
 #include "base/bittorrent/session.h"
@@ -47,60 +46,6 @@
 
 namespace
 {
-    QIcon getPausedIcon()
-    {
-        static QIcon cached = UIThemeManager::instance()->getIcon(u"paused"_qs);
-        return cached;
-    }
-
-    QIcon getQueuedIcon()
-    {
-        static QIcon cached = UIThemeManager::instance()->getIcon(u"queued"_qs);
-        return cached;
-    }
-
-    QIcon getDownloadingIcon()
-    {
-        static QIcon cached = UIThemeManager::instance()->getIcon(u"downloading"_qs);
-        return cached;
-    }
-
-    QIcon getStalledDownloadingIcon()
-    {
-        static QIcon cached = UIThemeManager::instance()->getIcon(u"stalledDL"_qs);
-        return cached;
-    }
-
-    QIcon getUploadingIcon()
-    {
-        static QIcon cached = UIThemeManager::instance()->getIcon(u"uploading"_qs);
-        return cached;
-    }
-
-    QIcon getStalledUploadingIcon()
-    {
-        static QIcon cached = UIThemeManager::instance()->getIcon(u"stalledUP"_qs);
-        return cached;
-    }
-
-    QIcon getCompletedIcon()
-    {
-        static QIcon cached = UIThemeManager::instance()->getIcon(u"completed"_qs);
-        return cached;
-    }
-
-    QIcon getCheckingIcon()
-    {
-        static QIcon cached = UIThemeManager::instance()->getIcon(u"checking"_qs);
-        return cached;
-    }
-
-    QIcon getErrorIcon()
-    {
-        static QIcon cached = UIThemeManager::instance()->getIcon(u"error"_qs);
-        return cached;
-    }
-
     bool isDarkTheme()
     {
         const QPalette pal = QApplication::palette();
@@ -109,48 +54,10 @@ namespace
         return (color.lightness() < 127);
     }
 
-    QIcon getIconByState(const BitTorrent::TorrentState state)
-    {
-        switch (state)
-        {
-        case BitTorrent::TorrentState::Downloading:
-        case BitTorrent::TorrentState::ForcedDownloading:
-        case BitTorrent::TorrentState::DownloadingMetadata:
-        case BitTorrent::TorrentState::ForcedDownloadingMetadata:
-            return getDownloadingIcon();
-        case BitTorrent::TorrentState::StalledDownloading:
-            return getStalledDownloadingIcon();
-        case BitTorrent::TorrentState::StalledUploading:
-            return getStalledUploadingIcon();
-        case BitTorrent::TorrentState::Uploading:
-        case BitTorrent::TorrentState::ForcedUploading:
-            return getUploadingIcon();
-        case BitTorrent::TorrentState::PausedDownloading:
-            return getPausedIcon();
-        case BitTorrent::TorrentState::PausedUploading:
-            return getCompletedIcon();
-        case BitTorrent::TorrentState::QueuedDownloading:
-        case BitTorrent::TorrentState::QueuedUploading:
-            return getQueuedIcon();
-        case BitTorrent::TorrentState::CheckingDownloading:
-        case BitTorrent::TorrentState::CheckingUploading:
-        case BitTorrent::TorrentState::CheckingResumeData:
-        case BitTorrent::TorrentState::Moving:
-            return getCheckingIcon();
-        case BitTorrent::TorrentState::Unknown:
-        case BitTorrent::TorrentState::MissingFiles:
-        case BitTorrent::TorrentState::Error:
-            return getErrorIcon();
-        default:
-            Q_ASSERT(false);
-            return getErrorIcon();
-        }
-    }
-
     QColor getDefaultColorByState(const BitTorrent::TorrentState state)
     {
         // Color names taken from http://cloford.com/resources/colours/500col.htm
-        bool dark = isDarkTheme();
+        const bool dark = isDarkTheme();
 
         switch (state)
         {
@@ -267,8 +174,17 @@ TransferListModel::TransferListModel(QObject *parent)
           {BitTorrent::TorrentState::Moving, tr("Moving", "Torrent local data are being moved/relocated")},
           {BitTorrent::TorrentState::MissingFiles, tr("Missing Files")},
           {BitTorrent::TorrentState::Error, tr("Errored", "Torrent status, the torrent has an error")}
-      }
+    }
     , m_stateThemeColors {torrentStateColorsFromUITheme()}
+    , m_checkingIcon {UIThemeManager::instance()->getIcon(u"checking"_qs)}
+    , m_completedIcon {UIThemeManager::instance()->getIcon(u"completed"_qs)}
+    , m_downloadingIcon {UIThemeManager::instance()->getIcon(u"downloading"_qs)}
+    , m_errorIcon {UIThemeManager::instance()->getIcon(u"error"_qs)}
+    , m_pausedIcon {UIThemeManager::instance()->getIcon(u"paused"_qs)}
+    , m_queuedIcon {UIThemeManager::instance()->getIcon(u"queued"_qs)}
+    , m_stalledDLIcon {UIThemeManager::instance()->getIcon(u"stalledDL"_qs)}
+    , m_stalledUPIcon {UIThemeManager::instance()->getIcon(u"stalledUP"_qs)}
+    , m_uploadingIcon {UIThemeManager::instance()->getIcon(u"uploading"_qs)}
 {
     configure();
     connect(Preferences::instance(), &Preferences::changed, this, &TransferListModel::configure);
@@ -796,3 +712,41 @@ void TransferListModel::configure()
         emit dataChanged(index(0, 0), index((rowCount() - 1), (columnCount() - 1)));
     }
 }
+
+QIcon TransferListModel::getIconByState(const BitTorrent::TorrentState state) const
+{
+    switch (state)
+    {
+    case BitTorrent::TorrentState::Downloading:
+    case BitTorrent::TorrentState::ForcedDownloading:
+    case BitTorrent::TorrentState::DownloadingMetadata:
+    case BitTorrent::TorrentState::ForcedDownloadingMetadata:
+        return m_downloadingIcon;
+    case BitTorrent::TorrentState::StalledDownloading:
+        return m_stalledDLIcon;
+    case BitTorrent::TorrentState::StalledUploading:
+        return m_stalledUPIcon;
+    case BitTorrent::TorrentState::Uploading:
+    case BitTorrent::TorrentState::ForcedUploading:
+        return m_uploadingIcon;
+    case BitTorrent::TorrentState::PausedDownloading:
+        return m_pausedIcon;
+    case BitTorrent::TorrentState::PausedUploading:
+        return m_completedIcon;
+    case BitTorrent::TorrentState::QueuedDownloading:
+    case BitTorrent::TorrentState::QueuedUploading:
+        return m_queuedIcon;
+    case BitTorrent::TorrentState::CheckingDownloading:
+    case BitTorrent::TorrentState::CheckingUploading:
+    case BitTorrent::TorrentState::CheckingResumeData:
+    case BitTorrent::TorrentState::Moving:
+        return m_checkingIcon;
+    case BitTorrent::TorrentState::Unknown:
+    case BitTorrent::TorrentState::MissingFiles:
+    case BitTorrent::TorrentState::Error:
+        return m_errorIcon;
+    default:
+        Q_ASSERT(false);
+        return m_errorIcon;
+    }
+}
diff --git a/src/gui/transferlistmodel.h b/src/gui/transferlistmodel.h
index dcd52600d..d5f1550d1 100644
--- a/src/gui/transferlistmodel.h
+++ b/src/gui/transferlistmodel.h
@@ -32,6 +32,7 @@
 #include <QAbstractListModel>
 #include <QColor>
 #include <QHash>
+#include <QIcon>
 #include <QList>
 
 #include "base/bittorrent/torrent.h"
@@ -111,6 +112,7 @@ private:
     void configure();
     QString displayValue(const BitTorrent::Torrent *torrent, int column) const;
     QVariant internalValue(const BitTorrent::Torrent *torrent, int column, bool alt) const;
+    QIcon getIconByState(const BitTorrent::TorrentState state) const;
 
     QList<BitTorrent::Torrent *> m_torrentList;  // maps row number to torrent handle
     QHash<BitTorrent::Torrent *, int> m_torrentMap;  // maps torrent handle to row number
@@ -126,4 +128,15 @@ private:
     };
 
     HideZeroValuesMode m_hideZeroValuesMode = HideZeroValuesMode::Never;
+
+    // cached icons
+    QIcon m_checkingIcon;
+    QIcon m_completedIcon;
+    QIcon m_downloadingIcon;
+    QIcon m_errorIcon;
+    QIcon m_pausedIcon;
+    QIcon m_queuedIcon;
+    QIcon m_stalledDLIcon;
+    QIcon m_stalledUPIcon;
+    QIcon m_uploadingIcon;
 };