diff --git a/src/csync/csync_exclude.cpp b/src/csync/csync_exclude.cpp
index bddb3047e0..9efe50df39 100644
--- a/src/csync/csync_exclude.cpp
+++ b/src/csync/csync_exclude.cpp
@@ -442,7 +442,9 @@ CSYNC_EXCLUDE_TYPE ExcludedFiles::traversalPatternMatch(const QString &path, Ite
             addExcludeFilePath(absolutePath);
             reloadExcludeFiles();
         } else {
+#if !defined QT_NO_DEBUG
             qWarning() << "System exclude list file could not be read:" << absolutePath;
+#endif
         }
     }
 
diff --git a/src/gui/socketapi/socketapi.cpp b/src/gui/socketapi/socketapi.cpp
index b657ecaa60..4b1dab50e5 100644
--- a/src/gui/socketapi/socketapi.cpp
+++ b/src/gui/socketapi/socketapi.cpp
@@ -316,7 +316,7 @@ void SocketApi::slotNewConnection()
     if (!socket) {
         return;
     }
-    qCInfo(lcSocketApi) << "New connection" << socket;
+    qCDebug(lcSocketApi) << "New connection" << socket;
     connect(socket, &QIODevice::readyRead, this, &SocketApi::slotReadSocket);
     connect(socket, SIGNAL(disconnected()), this, SLOT(onLostConnection()));
     connect(socket, &QObject::destroyed, this, &SocketApi::slotSocketDestroyed);
@@ -327,7 +327,7 @@ void SocketApi::slotNewConnection()
     for (Folder *f : FolderMan::instance()->map()) {
         if (f->canSync()) {
             QString message = buildRegisterPathMessage(removeTrailingSlash(f->path()));
-            qCInfo(lcSocketApi) << "Trying to send SocketAPI Register Path Message -->" << message << "to" << listener->socket;
+            qCDebug(lcSocketApi) << "Trying to send SocketAPI Register Path Message -->" << message << "to" << listener->socket;
             listener->sendMessage(message);
         }
     }
@@ -366,7 +366,7 @@ void SocketApi::slotReadSocket()
         // Make sure to normalize the input from the socket to
         // make sure that the path will match, especially on OS X.
         const QString line = QString::fromUtf8(socket->readLine().trimmed()).normalized(QString::NormalizationForm_C);
-        qCInfo(lcSocketApi) << "Received SocketAPI message <--" << line << "from" << socket;
+        qCDebug(lcSocketApi) << "Received SocketAPI message <--" << line << "from" << socket;
         const int argPos = line.indexOf(QLatin1Char(':'));
         const QByteArray command = line.midRef(0, argPos).toUtf8().toUpper();
         const int indexOfMethod = [&] {
diff --git a/src/gui/tray/activitylistmodel.cpp b/src/gui/tray/activitylistmodel.cpp
index a917a580a6..8e5f3e45b7 100644
--- a/src/gui/tray/activitylistmodel.cpp
+++ b/src/gui/tray/activitylistmodel.cpp
@@ -558,7 +558,7 @@ void ActivityListModel::addEntriesToActivityList(const ActivityList &activityLis
 
 void ActivityListModel::addErrorToActivityList(const Activity &activity, const ErrorType type)
 {
-    qCInfo(lcActivity) << "Error successfully added to the notification list: " << type << activity._message << activity._subject << activity._syncResultStatus << activity._syncFileItemStatus;
+    qCDebug(lcActivity) << "Error successfully added to the notification list: " << type << activity._message << activity._subject << activity._syncResultStatus << activity._syncFileItemStatus;
     auto modifiedActivity = activity;
     if (type == ErrorType::NetworkError) {
         modifiedActivity._subject = tr("Network error occurred: client will retry syncing.");
@@ -594,14 +594,14 @@ void ActivityListModel::addIgnoredFileToList(const Activity &newActivity)
 
 void ActivityListModel::addNotificationToActivityList(const Activity &activity)
 {
-    qCInfo(lcActivity) << "Notification successfully added to the notification list: " << activity._subject;
+    qCDebug(lcActivity) << "Notification successfully added to the notification list: " << activity._subject;
     addEntriesToActivityList({activity});
     _notificationLists.prepend(activity);
 }
 
 void ActivityListModel::addSyncFileItemToActivityList(const Activity &activity)
 {
-    qCInfo(lcActivity) << "Successfully added to the activity list: " << activity._subject;
+    qCDebug(lcActivity) << "Successfully added to the activity list: " << activity._subject;
     addEntriesToActivityList({activity});
     _syncFileItemLists.prepend(activity);
 }
diff --git a/src/libsync/bandwidthmanager.cpp b/src/libsync/bandwidthmanager.cpp
index f5fc3582bc..358822e6be 100644
--- a/src/libsync/bandwidthmanager.cpp
+++ b/src/libsync/bandwidthmanager.cpp
@@ -286,7 +286,7 @@ void BandwidthManager::relativeDownloadMeasuringTimerExpired()
     auto quota = relativeLimitProgressDifference * (downloadLimitPercent / 100.0);
 
     if (quota > 20 * 1024) {
-        qCInfo(lcBandwidthManager) << "ADJUSTING QUOTA FROM " << quota << " TO " << quota - 20 * 1024;
+        qCDebug(lcBandwidthManager) << "ADJUSTING QUOTA FROM " << quota << " TO " << quota - 20 * 1024;
         quota -= 20 * 1024;
     }
 
diff --git a/src/libsync/discovery.cpp b/src/libsync/discovery.cpp
index 81e180934d..e50817cb36 100644
--- a/src/libsync/discovery.cpp
+++ b/src/libsync/discovery.cpp
@@ -430,7 +430,6 @@ void ProcessDirectoryJob::processFile(PathTuple path,
                               << " | checksum: " << dbEntry._checksumHeader << "//" << serverEntry.checksumHeader
                               << " | perm: " << dbEntry._remotePerm << "//" << serverEntry.remotePerm
                               << " | fileid: " << dbEntry._fileId << "//" << serverEntry.fileId
-                              << " | inode: " << dbEntry._inode << "/" << localEntry.inode << "/"
                               << " | type: " << dbEntry._type << "/" << localEntry.type << "/" << (serverEntry.isDirectory ? ItemTypeDirectory : ItemTypeFile)
                               << " | e2ee: " << dbEntry.isE2eEncrypted() << "/" << serverEntry.isE2eEncrypted()
                               << " | e2eeMangledName: " << dbEntry.e2eMangledName() << "/" << serverEntry.e2eMangledName
@@ -553,7 +552,7 @@ void ProcessDirectoryJob::processFileAnalyzeRemoteInfo(
     item->_lockEditorApp = serverEntry.lockEditorApp;
     item->_lockTime = serverEntry.lockTime;
     item->_lockTimeout = serverEntry.lockTimeout;
-    qCInfo(lcDisco()) << item->_locked << item->_lockOwnerDisplayName << item->_lockOwnerId << item->_lockOwnerType << item->_lockEditorApp << item->_lockTime << item->_lockTimeout;
+    qCDebug(lcDisco()) << item->_locked << item->_lockOwnerDisplayName << item->_lockOwnerId << item->_lockOwnerType << item->_lockEditorApp << item->_lockTime << item->_lockTimeout;
 
     // Check for missing server data
     {
@@ -582,7 +581,7 @@ void ProcessDirectoryJob::processFileAnalyzeRemoteInfo(
         // Add on a second as a precaution, sometimes we catch the server before it has had a chance to update
         const auto lockExpirationTimeout = qMax(5LL, timeRemaining + 1);
 
-        qCInfo(lcDisco) << "File:" << path._original << "is locked."
+        qCDebug(lcDisco) << "File:" << path._original << "is locked."
                         << "Lock expires in:" << lockExpirationTimeout << "seconds."
                         << "A sync run will be scheduled for around that time.";
 
@@ -952,7 +951,9 @@ void ProcessDirectoryJob::processFileAnalyzeLocalInfo(
             // Not modified locally (ParentNotChanged)
             if (noServerEntry) {
                 // not on the server: Removed on the server, delete locally
+#if !defined QT_NO_DEBUG
                 qCInfo(lcDisco) << "File" << item->_file << "is not anymore on server. Going to delete it locally.";
+#endif
                 item->_instruction = CSYNC_INSTRUCTION_REMOVE;
                 item->_direction = SyncFileItem::Down;
             } else if (dbEntry._type == ItemTypeVirtualFileDehydration) {
@@ -980,7 +981,9 @@ void ProcessDirectoryJob::processFileAnalyzeLocalInfo(
         } else if (!serverModified) {
             // Removed locally: also remove on the server.
             if (!dbEntry._serverHasIgnoredFiles) {
+#if !defined QT_NO_DEBUG
                 qCInfo(lcDisco) << "File" << item->_file << "was deleted locally. Going to delete it on the server.";
+#endif
                 item->_instruction = CSYNC_INSTRUCTION_REMOVE;
                 item->_direction = SyncFileItem::Up;
             }
@@ -1019,7 +1022,9 @@ void ProcessDirectoryJob::processFileAnalyzeLocalInfo(
         } else if (!typeChange && ((dbEntry._modtime == localEntry.modtime && dbEntry._fileSize == localEntry.size) || localEntry.isDirectory)) {
             // Local file unchanged.
             if (noServerEntry) {
+#if !defined QT_NO_DEBUG
                 qCInfo(lcDisco) << "File" << item->_file << "is not anymore on server. Going to delete it locally.";
+#endif
                 item->_instruction = CSYNC_INSTRUCTION_REMOVE;
                 item->_direction = SyncFileItem::Down;
             } else if (dbEntry._type == ItemTypeVirtualFileDehydration || localEntry.type == ItemTypeVirtualFileDehydration) {
@@ -1538,7 +1543,7 @@ void ProcessDirectoryJob::processFileFinalize(
         item->_direction = _dirItem->_direction;
     }
 
-    qCInfo(lcDisco) << "Discovered" << item->_file << item->_instruction << item->_direction << item->_type;
+    qCDebug(lcDisco) << "Discovered" << item->_file << item->_instruction << item->_direction << item->_type;
 
     if (item->isDirectory() && item->_instruction == CSYNC_INSTRUCTION_SYNC)
         item->_instruction = CSYNC_INSTRUCTION_UPDATE_METADATA;
diff --git a/src/libsync/logger.cpp b/src/libsync/logger.cpp
index cab592adfd..fffbbc14c6 100644
--- a/src/libsync/logger.cpp
+++ b/src/libsync/logger.cpp
@@ -36,7 +36,7 @@
 namespace {
 
 constexpr int CrashLogSize = 20;
-constexpr int MaxLogSizeBytes = 1024 * 1024 * 30;
+constexpr auto MaxLogLinesCount = 50000;
 
 static bool compressLog(const QString &originalName, const QString &targetName)
 {
@@ -118,7 +118,8 @@ bool Logger::isLoggingToFile() const
 
 void Logger::doLog(QtMsgType type, const QMessageLogContext &ctx, const QString &message)
 {
-    const QString msg = qFormatLogMessage(type, ctx, message);
+    static long long int linesCounter = 0;
+    const auto &msg = qFormatLogMessage(type, ctx, message);
 #if defined(Q_OS_WIN) && defined(QT_DEBUG)
     // write logs to Output window of Visual Studio
     {
@@ -146,10 +147,12 @@ void Logger::doLog(QtMsgType type, const QMessageLogContext &ctx, const QString
     {
         QMutexLocker lock(&_mutex);
 
-        if (_logFile.size() >= MaxLogSizeBytes) {
+        if (linesCounter >= MaxLogLinesCount) {
+            linesCounter = 0;
             closeNoLock();
             enterNextLogFileNoLock();
         }
+        ++linesCounter;
 
         _crashLogIndex = (_crashLogIndex + 1) % CrashLogSize;
         _crashLog[_crashLogIndex] = msg;
diff --git a/src/libsync/propagatedownload.cpp b/src/libsync/propagatedownload.cpp
index b82f80a7c0..2edd3c4c5b 100644
--- a/src/libsync/propagatedownload.cpp
+++ b/src/libsync/propagatedownload.cpp
@@ -306,7 +306,7 @@ void GETFileJob::slotReadyRead()
         if (_bandwidthLimited) {
             toRead = qMin(qint64(bufferSize), _bandwidthQuota);
             if (toRead == 0) {
-                qCWarning(lcGetJob) << "Out of quota";
+                qCDebug(lcGetJob) << "Out of quota";
                 break;
             }
             _bandwidthQuota -= toRead;
diff --git a/src/libsync/syncengine.cpp b/src/libsync/syncengine.cpp
index f162b0ed5a..5f955ac0dd 100644
--- a/src/libsync/syncengine.cpp
+++ b/src/libsync/syncengine.cpp
@@ -624,7 +624,7 @@ void SyncEngine::startSync()
     _discoveryPhase->_syncOptions = _syncOptions;
     _discoveryPhase->_shouldDiscoverLocaly = [this](const QString &path) {
         const auto result = shouldDiscoverLocally(path);
-        qCInfo(lcEngine) << "shouldDiscoverLocaly" << path << (result ? "true" : "false");
+        qCDebug(lcEngine) << "shouldDiscoverLocaly" << path << (result ? "true" : "false");
         return result;
     };
     _discoveryPhase->setSelectiveSyncBlackList(selectiveSyncBlackList);
diff --git a/src/libsync/syncfilestatustracker.cpp b/src/libsync/syncfilestatustracker.cpp
index 7d03fba32e..6117ef2239 100644
--- a/src/libsync/syncfilestatustracker.cpp
+++ b/src/libsync/syncfilestatustracker.cpp
@@ -226,7 +226,7 @@ void SyncFileStatusTracker::slotAboutToPropagate(SyncFileItemVector &items)
     std::swap(_syncProblems, oldProblems);
 
     foreach (const SyncFileItemPtr &item, items) {
-        qCDebug(lcStatusTracker) << "Investigating" << item->destination() << item->_status << item->_instruction << item->_direction;
+        qCInfo(lcStatusTracker) << "Investigating" << item->destination() << item->_status << item->_instruction << item->_direction;
         _dirtyPaths.remove(item->destination());
 
         if (hasErrorStatus(*item)) {