diff --git a/Pdf4QtViewer/pdftexttospeech.cpp b/Pdf4QtViewer/pdftexttospeech.cpp
index db2c651..bae88a9 100644
--- a/Pdf4QtViewer/pdftexttospeech.cpp
+++ b/Pdf4QtViewer/pdftexttospeech.cpp
@@ -83,6 +83,18 @@ void PDFTextToSpeech::setDocument(const pdf::PDFModifiedDocument& document)
     }
 }
 
+void PDFTextToSpeech::updateVoices()
+{
+    QVector<QVoice> voices = m_textToSpeech->availableVoices();
+    m_speechVoiceComboBox->setUpdatesEnabled(false);
+    m_speechVoiceComboBox->clear();
+    for (const QVoice& voice : voices)
+    {
+        m_speechVoiceComboBox->addItem(QString("%1 (%2, %3)").arg(voice.name(), QVoice::genderName(voice.gender()), QVoice::ageName(voice.age())), voice.name());
+    }
+    m_speechVoiceComboBox->setUpdatesEnabled(true);
+}
+
 void PDFTextToSpeech::setSettings(const PDFViewerSettings* viewerSettings)
 {
     Q_ASSERT(viewerSettings);
@@ -103,6 +115,7 @@ void PDFTextToSpeech::setSettings(const PDFViewerSettings* viewerSettings)
     if (!settings.m_speechEngine.isEmpty())
     {
         m_textToSpeech = new QTextToSpeech(settings.m_speechEngine, this);
+        m_textToSpeech->setLocale(QLocale(settings.m_speechLocale));
         connect(m_textToSpeech, &QTextToSpeech::stateChanged, this, &PDFTextToSpeech::updatePlay);
         m_state = m_document ? Ready : NoDocument;
 
@@ -115,14 +128,7 @@ void PDFTextToSpeech::setSettings(const PDFViewerSettings* viewerSettings)
         }
         m_speechLocaleComboBox->setUpdatesEnabled(true);
 
-        QVector<QVoice> voices = m_textToSpeech->availableVoices();
-        m_speechVoiceComboBox->setUpdatesEnabled(false);
-        m_speechVoiceComboBox->clear();
-        for (const QVoice& voice : voices)
-        {
-            m_speechVoiceComboBox->addItem(QString("%1 (%2, %3)").arg(voice.name(), QVoice::genderName(voice.gender()), QVoice::ageName(voice.age())), voice.name());
-        }
-        m_speechVoiceComboBox->setUpdatesEnabled(true);
+        updateVoices();
     }
     else
     {
@@ -340,6 +346,12 @@ void PDFTextToSpeech::onLocaleChanged()
     if (m_textToSpeech)
     {
         m_textToSpeech->setLocale(QLocale(m_speechLocaleComboBox->currentData().toString()));
+        updateVoices();
+
+        if (m_speechVoiceComboBox->currentIndex() == -1)
+        {
+            m_speechVoiceComboBox->setCurrentIndex(0);
+        }
     }
 }
 
diff --git a/Pdf4QtViewer/pdftexttospeech.h b/Pdf4QtViewer/pdftexttospeech.h
index db4feff..7e19f82 100644
--- a/Pdf4QtViewer/pdftexttospeech.h
+++ b/Pdf4QtViewer/pdftexttospeech.h
@@ -114,6 +114,7 @@ private:
     void onStopClicked();
 
     void updatePlay();
+    void updateVoices();
     void updateToNextPage(pdf::PDFInteger pageIndex);
 
     QTextToSpeech* m_textToSpeech;
diff --git a/Pdf4QtViewer/pdfviewersettings.cpp b/Pdf4QtViewer/pdfviewersettings.cpp
index 2ad124b..0dab45a 100644
--- a/Pdf4QtViewer/pdfviewersettings.cpp
+++ b/Pdf4QtViewer/pdfviewersettings.cpp
@@ -264,7 +264,7 @@ PDFViewerSettings::Settings::Settings() :
     m_allowLaunchURI(true),
     m_allowDeveloperMode(false),
     m_multithreadingStrategy(pdf::PDFExecutionPolicy::Strategy::AlwaysMultithreaded),
-    m_compiledPageCacheLimit(128 * 1024),
+    m_compiledPageCacheLimit(512 * 1024),
     m_thumbnailsCacheLimit(PIXMAP_CACHE_LIMIT),
     m_fontCacheLimit(pdf::DEFAULT_FONT_CACHE_LIMIT),
     m_instancedFontCacheLimit(pdf::DEFAULT_REALIZED_FONT_CACHE_LIMIT),
diff --git a/Pdf4QtViewer/pdfviewersettingsdialog.cpp b/Pdf4QtViewer/pdfviewersettingsdialog.cpp
index 063c665..78796ff 100644
--- a/Pdf4QtViewer/pdfviewersettingsdialog.cpp
+++ b/Pdf4QtViewer/pdfviewersettingsdialog.cpp
@@ -189,16 +189,16 @@ PDFViewerSettingsDialog::PDFViewerSettingsDialog(const PDFViewerSettings::Settin
     connect(ui->trustedCertificateStoreTableWidget, &QTableWidget::itemSelectionChanged, this, &PDFViewerSettingsDialog::updateTrustedCertificatesTableActions);
     connect(ui->pluginsTableWidget, &QTableWidget::itemSelectionChanged, this, &PDFViewerSettingsDialog::updatePluginInformation);
 
-    setMinimumSize(pdf::PDFWidgetUtils::scaleDPI(this, QSize(1000, 700)));
+    setMinimumSize(pdf::PDFWidgetUtils::scaleDPI(this, QSize(1000, 800)));
     pdf::PDFWidgetUtils::style(this);
 
     ui->optionsPagesWidget->setCurrentRow(0);
-    adjustSize();
     loadData();
     loadActionShortcutsTable();
     loadPluginsTable();
     updateTrustedCertificatesTable();
     updateTrustedCertificatesTableActions();
+    resize(sizeHint());
 }
 
 PDFViewerSettingsDialog::~PDFViewerSettingsDialog()
@@ -387,8 +387,7 @@ void PDFViewerSettingsDialog::loadData()
 
     // Text-to-speech
     ui->speechEnginesComboBox->setCurrentIndex(ui->speechEnginesComboBox->findData(m_settings.m_speechEngine));
-    QString speechEngine = ui->speechEnginesComboBox->currentData().toString();
-    setSpeechEngine(speechEngine);
+    setSpeechEngine(m_settings.m_speechEngine, m_settings.m_speechLocale);
     ui->speechLocaleComboBox->setCurrentIndex(ui->speechLocaleComboBox->findData(m_settings.m_speechLocale));
     ui->speechVoiceComboBox->setCurrentIndex(ui->speechVoiceComboBox->findData(m_settings.m_speechVoice));
     ui->speechRateEdit->setValue(m_settings.m_speechRate);
@@ -795,24 +794,31 @@ void PDFViewerSettingsDialog::updatePluginInformation()
     }
 }
 
-void PDFViewerSettingsDialog::setSpeechEngine(const QString& engine)
+void PDFViewerSettingsDialog::setSpeechEngine(const QString& engine, const QString& locale)
 {
-    if (m_currentSpeechEngine == engine)
+    if (m_currentSpeechEngine == engine && m_currentSpeechLocale == locale)
     {
         return;
     }
 
-    m_currentSpeechEngine = engine;
     QTextToSpeech textToSpeech(engine, nullptr);
+    textToSpeech.setLocale(QLocale(locale));
 
-    QVector<QLocale> locales = textToSpeech.availableLocales();
-    ui->speechLocaleComboBox->setUpdatesEnabled(false);
-    ui->speechLocaleComboBox->clear();
-    for (const QLocale& locale : locales)
+    if (m_currentSpeechEngine != engine)
     {
-        ui->speechLocaleComboBox->addItem(QString("%1 (%2)").arg(locale.nativeLanguageName(), locale.nativeCountryName()), locale.name());
+        m_currentSpeechEngine = engine;
+
+        QVector<QLocale> locales = textToSpeech.availableLocales();
+        ui->speechLocaleComboBox->setUpdatesEnabled(false);
+        ui->speechLocaleComboBox->clear();
+        for (const QLocale& locale : locales)
+        {
+            ui->speechLocaleComboBox->addItem(QString("%1 (%2)").arg(locale.nativeLanguageName(), locale.nativeCountryName()), locale.name());
+        }
+        ui->speechLocaleComboBox->setUpdatesEnabled(true);
     }
-    ui->speechLocaleComboBox->setUpdatesEnabled(true);
+
+    m_currentSpeechLocale = locale;
 
     QVector<QVoice> voices = textToSpeech.availableVoices();
     ui->speechVoiceComboBox->setUpdatesEnabled(false);
diff --git a/Pdf4QtViewer/pdfviewersettingsdialog.h b/Pdf4QtViewer/pdfviewersettingsdialog.h
index e7613ef..c21563d 100644
--- a/Pdf4QtViewer/pdfviewersettingsdialog.h
+++ b/Pdf4QtViewer/pdfviewersettingsdialog.h
@@ -107,7 +107,7 @@ private:
     void savePluginsTable();
     void updatePluginInformation();
 
-    void setSpeechEngine(const QString& engine);
+    void setSpeechEngine(const QString& engine, const QString& locale);
 
     /// Returns true, if dialog can be closed. If not, then message is displayed
     /// and false is returned.
@@ -121,6 +121,7 @@ private:
     bool m_isLoadingData;
     QStringList m_textToSpeechEngines;
     QString m_currentSpeechEngine;
+    QString m_currentSpeechLocale;
     pdf::PDFCertificateStore m_certificateStore;
     QStringList m_enabledPlugins;
     pdf::PDFPluginInfos m_plugins;