diff --git a/lib/jkqtcommon/jkqtpbasicimagetools.cpp b/lib/jkqtcommon/jkqtpbasicimagetools.cpp
index 91dc63be0f..67b3b038e5 100644
--- a/lib/jkqtcommon/jkqtpbasicimagetools.cpp
+++ b/lib/jkqtcommon/jkqtpbasicimagetools.cpp
@@ -38,6 +38,7 @@ const int JKQTPImageTools::LUTSIZE = 256;
 
 QMap<int, JKQTPImageTools::LUTData > JKQTPImageTools::global_jkqtpimagetools_lutstore = JKQTPImageTools::getDefaultLUTs();
 int JKQTPImageTools::global_next_userpalette = JKQTPMathImageFIRST_REGISTERED_USER_PALETTE;
+std::mutex JKQTPImageTools::lutMutex = std::mutex();
 
 
 
@@ -2648,6 +2649,7 @@ bool JKQTPImagePlot_QPairCompareFirst(const QPair<T1, T2> &s1, const QPair<T1, T
 }
 
 QStringList JKQTPImageTools::getPredefinedPalettes()  {
+    std::lock_guard<std::mutex> lock(JKQTPImageTools::lutMutex);
     static QStringList sl;
 
     if (sl.size()!=JKQTPImageTools::global_jkqtpimagetools_lutstore.size()) {
@@ -2665,6 +2667,7 @@ QStringList JKQTPImageTools::getPredefinedPalettes()  {
 
 
 QStringList JKQTPImageTools::getPredefinedPalettesMachineReadable()  {
+    std::lock_guard<std::mutex> lock(JKQTPImageTools::lutMutex);
     static QStringList sl;
 
     if (sl.size()!=JKQTPImageTools::global_jkqtpimagetools_lutstore.size()) {
@@ -2686,6 +2689,7 @@ QStringList JKQTPImageTools::getPredefinedPalettesMachineReadable()  {
 
 QString JKQTPImageTools::JKQTPMathImageColorPalette2String(JKQTPMathImageColorPalette p)
 {
+    std::lock_guard<std::mutex> lock(JKQTPImageTools::lutMutex);
     auto it=JKQTPImageTools::global_jkqtpimagetools_lutstore.find(p);
     if (it==JKQTPImageTools::global_jkqtpimagetools_lutstore.end()) return QString::number(static_cast<int>(p));
     else {
@@ -2696,6 +2700,7 @@ QString JKQTPImageTools::JKQTPMathImageColorPalette2String(JKQTPMathImageColorPa
 
 JKQTPMathImageColorPalette JKQTPImageTools::String2JKQTPMathImageColorPalette(const QString &p)
 {
+    std::lock_guard<std::mutex> lock(JKQTPImageTools::lutMutex);
     for (auto it=JKQTPImageTools::global_jkqtpimagetools_lutstore.begin(); it!=JKQTPImageTools::global_jkqtpimagetools_lutstore.end(); ++it) {
         if (QString::compare(p, it.value().name, Qt::CaseInsensitive)==0) {
             return static_cast<JKQTPMathImageColorPalette>(it.key());
@@ -2807,6 +2812,7 @@ QIcon JKQTPImageTools::GetPaletteIcon(JKQTPMathImageColorPalette palette)  {
 
 int JKQTPImageTools::registerPalette(const QString &name, const JKQTPImageTools::LUTType &paletteLut, const QString &nameT)
 {
+    std::lock_guard<std::mutex> lock(JKQTPImageTools::lutMutex);
     int id=JKQTPImageTools::global_next_userpalette++;
     JKQTPImageTools::global_jkqtpimagetools_lutstore[id].name=name;
     JKQTPImageTools::global_jkqtpimagetools_lutstore[id].nameT=((nameT.size()>0)?nameT:name);
diff --git a/lib/jkqtcommon/jkqtpbasicimagetools.h b/lib/jkqtcommon/jkqtpbasicimagetools.h
index 9641117be5..9d4659061c 100644
--- a/lib/jkqtcommon/jkqtpbasicimagetools.h
+++ b/lib/jkqtcommon/jkqtpbasicimagetools.h
@@ -28,6 +28,7 @@
 #include <cfloat>
 #include <stdint.h>
 #include <QColor>
+#include <mutex>
 #include <vector>
 #include "jkqtcommon/jkqtcommon_imexport.h"
 #include "jkqtcommon/jkqtpmathtools.h"
@@ -482,6 +483,9 @@ struct JKQTPImageTools {
             \see registerPalette() registerPalettesFromFile()
             */
         static JKQTCOMMON_LIB_EXPORT int global_next_userpalette;
+        /** \brief Mutex to protect global_jkqtpimagetools_lutstore and global_next_userpalette */
+        static JKQTCOMMON_LIB_EXPORT std::mutex lutMutex;
+
 
         /*! \brief returns data of the default LUTs, used to initialize global_jkqtpimagetools_lutstore
             \internal
diff --git a/lib/jkqtcommon/jkqtpdebuggingtools.cpp b/lib/jkqtcommon/jkqtpdebuggingtools.cpp
index b474a2059d..69b90cac5a 100644
--- a/lib/jkqtcommon/jkqtpdebuggingtools.cpp
+++ b/lib/jkqtcommon/jkqtpdebuggingtools.cpp
@@ -23,15 +23,15 @@
 #include <QApplication>
 
 
-
-
-int JKQTPAutoOutputTimer::global_indent=0;
+namespace JKQTPAutoOutputTimer_private {
+    thread_local int global_indent=0;
+}
 
 JKQTPAutoOutputTimer::JKQTPAutoOutputTimer(const QString& _message) :
     QElapsedTimer(),message(_message),indent()
 {
-    this->indent=QString(global_indent, QLatin1Char(' '));
-    global_indent+=4;
+    this->indent=QString(JKQTPAutoOutputTimer_private::global_indent, QLatin1Char(' '));
+    JKQTPAutoOutputTimer_private::global_indent+=4;
 #if QT_VERSION >= 0x040800
     qDebug()<<this->indent<<"TIMER_START:  "<<message;
 #else
@@ -47,7 +47,7 @@ JKQTPAutoOutputTimer::~JKQTPAutoOutputTimer()
     #else
         qDebug()<<this->indent<<"TIMER_END:  "<<message<<"    DUR: "<<double(elapsed())/1.0e3<<"ms";
     #endif
-    global_indent-=4;
+    JKQTPAutoOutputTimer_private::global_indent-=4;
 
 }
 
diff --git a/lib/jkqtcommon/jkqtpdebuggingtools.h b/lib/jkqtcommon/jkqtpdebuggingtools.h
index 9298c3538e..7297ee261c 100644
--- a/lib/jkqtcommon/jkqtpdebuggingtools.h
+++ b/lib/jkqtcommon/jkqtpdebuggingtools.h
@@ -62,7 +62,7 @@ class JKQTCOMMON_LIB_EXPORT JKQTPAutoOutputTimer : public QElapsedTimer
     protected:
         QString message;
         QString indent;
-        static int global_indent;
+
 
 };
 
diff --git a/lib/jkqtcommon/jkqtpstringtools.cpp b/lib/jkqtcommon/jkqtpstringtools.cpp
index 83b63c7854..fc0a73fbd8 100644
--- a/lib/jkqtcommon/jkqtpstringtools.cpp
+++ b/lib/jkqtcommon/jkqtpstringtools.cpp
@@ -523,7 +523,7 @@ static const struct RGBData {
 static const int rgbTblSize = sizeof(rgbTbl) / sizeof(RGBData);
 
 const QStringList& jkqtp_listNamedColors() {
-    static QStringList sl;
+    thread_local QStringList sl;
     if (sl.size()==0) {
         sl.reserve(rgbTblSize);
         for (int i=0; i<rgbTblSize; i++) {
diff --git a/lib/jkqtmathtext/jkqtmathtext.cpp b/lib/jkqtmathtext/jkqtmathtext.cpp
index 7acd7934a0..dfc4690461 100644
--- a/lib/jkqtmathtext/jkqtmathtext.cpp
+++ b/lib/jkqtmathtext/jkqtmathtext.cpp
@@ -46,6 +46,7 @@
 #include <QFontMetricsF>
 #include <QDebug>
 #include <QFontDatabase>
+#include <mutex>
 #include <typeinfo>
 #include <QPainterPath>
 
@@ -63,6 +64,7 @@ QString JKQTMathText::init_caligraphicFont="decorative";
 QString JKQTMathText::init_blackboardFont="blackboard";
 QString JKQTMathText::init_fracturFont="fraktur";
 bool JKQTMathText::s_firstStart=true;
+std::mutex JKQTMathText::s_mutex=std::mutex();
 
 
 
@@ -126,7 +128,7 @@ JKQTMathText::JKQTMathText(QObject* parent, bool useFontsForGUI):
 
 
 
-
+    std::lock_guard<std::mutex> lock(s_mutex);
     if (s_firstStart) {
         //t0=std::chrono::high_resolution_clock::now();
 
diff --git a/lib/jkqtmathtext/jkqtmathtext.h b/lib/jkqtmathtext/jkqtmathtext.h
index 5825f19166..23677300ad 100644
--- a/lib/jkqtmathtext/jkqtmathtext.h
+++ b/lib/jkqtmathtext/jkqtmathtext.h
@@ -40,6 +40,7 @@
 #include <QPixmap>
 #include <type_traits>
 #include <memory>
+#include <mutex>
 
 
 class JKQTMathTextNode; // forward
@@ -1069,6 +1070,8 @@ class JKQTMATHTEXT_LIB_EXPORT JKQTMathText : public QObject {
         static QString init_fracturFont;
         /** \brief used to check for the first construction of a JKQTMathText ... if \c true several static variables are initialized in the constructor */
         static bool s_firstStart;
+        /** \brief mutex to protect the static members */
+        static std::mutex s_mutex;
 };
 
 
diff --git a/lib/jkqtmathtext/jkqtmathtexttools.cpp b/lib/jkqtmathtext/jkqtmathtexttools.cpp
index 6d7eff0a06..4b50daf5a8 100644
--- a/lib/jkqtmathtext/jkqtmathtexttools.cpp
+++ b/lib/jkqtmathtext/jkqtmathtexttools.cpp
@@ -21,7 +21,6 @@
 
 #include "jkqtmathtext/jkqtmathtexttools.h"
 #include "jkqtmathtext/jkqtmathtext.h"
-#include "jkqtcommon/jkqtpcodestructuring.h"
 #include "jkqtcommon/jkqtpstringtools.h"
 #include <cmath>
 #include <QFontMetricsF>
@@ -35,6 +34,8 @@
 void initJKQTMathTextResources()
 {
     static bool initialized=false;
+    static std::mutex mutex_initialized;
+    std::lock_guard<std::mutex> lock(mutex_initialized);
     if (!initialized) {
 #ifdef JKQTMATHTEXT_COMPILED_WITH_XITS
         Q_INIT_RESOURCE(xits);
@@ -249,6 +250,8 @@ JKQTMathTextFontSpecifier JKQTMathTextFontSpecifier::getXITSFamilies()
     }
 
     static JKQTMathTextFontSpecifier fontSpec;
+    static std::mutex fontSpecMutex;
+    std::lock_guard<std::mutex> lock(fontSpecMutex);
     if (fontSpec.m_fontName.isEmpty() && fontSpec.m_mathFontName.isEmpty()) {
         fontSpec.m_transformOnOutput=false;
         for (int i=0; i<fontFamilies.size(); i++) {
@@ -287,6 +290,8 @@ JKQTMathTextFontSpecifier JKQTMathTextFontSpecifier::getASANAFamilies()
 
 
     static JKQTMathTextFontSpecifier fontSpec;
+    static std::mutex fontSpecMutex;
+    std::lock_guard<std::mutex> lock(fontSpecMutex);
     if (fontSpec.m_fontName.isEmpty() && fontSpec.m_mathFontName.isEmpty()) {
         fontSpec.m_transformOnOutput=false;
         for (int i=0; i<fontFamilies.size(); i++) {
@@ -318,6 +323,8 @@ JKQTMathTextFontSpecifier JKQTMathTextFontSpecifier::getSTIXFamilies()
     static QStringList textNames{"STIX", "STIXGeneral", "STIX General"};
 
     static JKQTMathTextFontSpecifier fontSpec;
+    static std::mutex fontSpecMutex;
+    std::lock_guard<std::mutex> lock(fontSpecMutex);
     if (fontSpec.m_fontName.isEmpty() && fontSpec.m_mathFontName.isEmpty()) {
         fontSpec.m_transformOnOutput=false;
 #if (QT_VERSION<QT_VERSION_CHECK(6, 0, 0))
@@ -376,6 +383,8 @@ JKQTMathTextFontSpecifier JKQTMathTextFontSpecifier::getFIRAFamilies()
     }
 
     static JKQTMathTextFontSpecifier fontSpec;
+    static std::mutex fontSpecMutex;
+    std::lock_guard<std::mutex> lock(fontSpecMutex);
     if (fontSpec.m_fontName.isEmpty() && fontSpec.m_mathFontName.isEmpty()) {
         fontSpec.m_transformOnOutput=false;
         for (int i=0; i<fontFamilies.size(); i++) {
@@ -404,6 +413,8 @@ JKQTMathTextFontSpecifier JKQTMathTextFontSpecifier::getFIRAFamilies()
 JKQTMathTextFontSpecifier JKQTMathTextFontSpecifier::getAppFontFamilies()
 {
     static JKQTMathTextFontSpecifier fontSpec;
+    static std::mutex fontSpecMutex;
+    std::lock_guard<std::mutex> lock(fontSpecMutex);
     if (fontSpec.m_fontName.isEmpty() && fontSpec.m_mathFontName.isEmpty()) {
 #if (QT_VERSION<QT_VERSION_CHECK(6, 0, 0))
         QFontDatabase fdb;
@@ -444,6 +455,8 @@ JKQTMathTextFontSpecifier JKQTMathTextFontSpecifier::getAppFontFamilies()
 JKQTMathTextFontSpecifier JKQTMathTextFontSpecifier::getAppFontSFFamilies()
 {
     static JKQTMathTextFontSpecifier fontSpec;
+    static std::mutex fontSpecMutex;
+    std::lock_guard<std::mutex> lock(fontSpecMutex);
     if (fontSpec.m_fontName.isEmpty() && fontSpec.m_mathFontName.isEmpty()) {
         const QFont f=QGuiApplication::font().family();
         QFont testFnt;
@@ -927,8 +940,8 @@ bool JKQTMathTextTBRDataH::operator==(const JKQTMathTextTBRDataH &other) const
 
 QRectF JKQTMathTextGetTightBoundingRect(const QFont &fm, const QString &text, QPaintDevice *pd)
 {
-    static QList<JKQTMathTextTBRData> JKQTMathText_tbrs=QList<JKQTMathTextTBRData>();
-    static QHash<JKQTMathTextTBRDataH, QRectF> JKQTMathText_tbrh=QHash<JKQTMathTextTBRDataH, QRectF>();
+    thread_local QList<JKQTMathTextTBRData> JKQTMathText_tbrs=QList<JKQTMathTextTBRData>();
+    thread_local QHash<JKQTMathTextTBRDataH, QRectF> JKQTMathText_tbrh=QHash<JKQTMathTextTBRDataH, QRectF>();
 
     JKQTMathTextTBRDataH  dh(fm, text, pd);
     if (pd) {
diff --git a/lib/jkqtmathtext/nodes/jkqtmathtextboxinstructionnode.cpp b/lib/jkqtmathtext/nodes/jkqtmathtextboxinstructionnode.cpp
index 55cb324a6e..6083a6c84a 100644
--- a/lib/jkqtmathtext/nodes/jkqtmathtextboxinstructionnode.cpp
+++ b/lib/jkqtmathtext/nodes/jkqtmathtextboxinstructionnode.cpp
@@ -169,6 +169,9 @@ QHash<QString, JKQTMathTextBoxInstructionNode::InstructionProperties> JKQTMathTe
 
 void JKQTMathTextBoxInstructionNode::fillInstructions()
 {
+    static std::mutex sMutex;
+    std::lock_guard<std::mutex> lock(sMutex);
+    if (instructions.size()>0) return;
 
     {
         InstructionProperties i(InstructionProperties::NoModification,
diff --git a/lib/jkqtmathtext/nodes/jkqtmathtextdecoratednode.cpp b/lib/jkqtmathtext/nodes/jkqtmathtextdecoratednode.cpp
index 940e9c671e..d32af005f4 100644
--- a/lib/jkqtmathtext/nodes/jkqtmathtextdecoratednode.cpp
+++ b/lib/jkqtmathtext/nodes/jkqtmathtextdecoratednode.cpp
@@ -172,6 +172,8 @@ QHash<QString, JKQTMathTextDecoratedNode::DecorationType> JKQTMathTextDecoratedN
 
 void JKQTMathTextDecoratedNode::fillInstructions()
 {
+    static std::mutex sMutex;
+    std::lock_guard<std::mutex> lock(sMutex);
     if (instructions.size()>0) return;
 
     instructions["vec"]=MTDvec;
diff --git a/lib/jkqtmathtext/nodes/jkqtmathtextfracnode.cpp b/lib/jkqtmathtext/nodes/jkqtmathtextfracnode.cpp
index 00046f2ea6..92ed57615b 100644
--- a/lib/jkqtmathtext/nodes/jkqtmathtextfracnode.cpp
+++ b/lib/jkqtmathtext/nodes/jkqtmathtextfracnode.cpp
@@ -39,6 +39,8 @@ QHash<QString, JKQTMathTextFracNode::FracType> JKQTMathTextFracNode::instruction
 
 void JKQTMathTextFracNode::fillInstructions()
 {
+    static std::mutex sMutex;
+    std::lock_guard<std::mutex> lock(sMutex);
     if (instructions.size()>0) return;
     instructions["frac"]=MTFMfrac;
     instructions["dfrac"] = MTFMdfrac;
diff --git a/lib/jkqtmathtext/nodes/jkqtmathtextinstructionnode.cpp b/lib/jkqtmathtext/nodes/jkqtmathtextinstructionnode.cpp
index f6b40ebfe1..1b8ab1ca4c 100644
--- a/lib/jkqtmathtext/nodes/jkqtmathtextinstructionnode.cpp
+++ b/lib/jkqtmathtext/nodes/jkqtmathtextinstructionnode.cpp
@@ -144,6 +144,9 @@ QHash<QString, JKQTMathTextSimpleInstructionNode::InstructionProperties> JKQTMat
 
 void JKQTMathTextSimpleInstructionNode::fillInstructions()
 {
+    static std::mutex sMutex;
+    std::lock_guard<std::mutex> lock(sMutex);
+    if (instructions.size()>0) return;
     {
         InstructionProperties i([](const QStringList& parameters) -> QString {
             bool ok=false;
diff --git a/lib/jkqtmathtext/nodes/jkqtmathtextmodifyenvironmentnode.cpp b/lib/jkqtmathtext/nodes/jkqtmathtextmodifyenvironmentnode.cpp
index 7274f2be4a..584a8a68e1 100644
--- a/lib/jkqtmathtext/nodes/jkqtmathtextmodifyenvironmentnode.cpp
+++ b/lib/jkqtmathtext/nodes/jkqtmathtextmodifyenvironmentnode.cpp
@@ -116,6 +116,9 @@ QHash<QString, JKQTMathTextModifiedTextPropsInstructionNode::InstructionProperti
 void JKQTMathTextModifiedTextPropsInstructionNode::fillInstructions()
 {
 
+    static std::mutex sMutex;
+    std::lock_guard<std::mutex> lock(sMutex);
+    if (instructions.size()>0) return;
     {
         InstructionProperties i([](JKQTMathTextEnvironment& ev, const QStringList& /*parameters*/) {
             ev.bold=false;
@@ -534,6 +537,9 @@ QHash<QString, JKQTMathTextModifiedEnvironmentInstructionNode::InstructionProper
 
 void JKQTMathTextModifiedEnvironmentInstructionNode::fillInstructions()
 {
+    static std::mutex sMutex;
+    std::lock_guard<std::mutex> lock(sMutex);
+    if (instructions.size()>0) return;
 
     {
         InstructionProperties i([](JKQTMathTextEnvironment& ev, const QStringList& /*parameters*/, const JKQTMathText* parentMathText) {
diff --git a/lib/jkqtmathtext/nodes/jkqtmathtextsymbolnode.cpp b/lib/jkqtmathtext/nodes/jkqtmathtextsymbolnode.cpp
index f38007dcc9..e055e0dc1f 100644
--- a/lib/jkqtmathtext/nodes/jkqtmathtextsymbolnode.cpp
+++ b/lib/jkqtmathtext/nodes/jkqtmathtextsymbolnode.cpp
@@ -491,6 +491,8 @@ QHash<QString, JKQTMathTextSymbolNode::SymbolFullProps> JKQTMathTextSymbolNode::
 
 void JKQTMathTextSymbolNode::fillSymbolTables()
 {
+    static std::mutex sMutex;
+    std::lock_guard<std::mutex> lock(sMutex);
     if (symbols.size()>0) return; // tables have already been filled! So nothing to do here
 
     /**************************************************************************************
diff --git a/lib/jkqtmathtext/nodes/jkqtmathtexttextnode.cpp b/lib/jkqtmathtext/nodes/jkqtmathtexttextnode.cpp
index 002fc9741c..66e1ec3d35 100644
--- a/lib/jkqtmathtext/nodes/jkqtmathtexttextnode.cpp
+++ b/lib/jkqtmathtext/nodes/jkqtmathtexttextnode.cpp
@@ -76,15 +76,10 @@ bool JKQTMathTextTextBaseNode::toHtml(QString &html, JKQTMathTextEnvironment cur
 QHash<QChar, uint32_t> JKQTMathTextTextNode::blackboardUnicodeTable=QHash<QChar, uint32_t>();
 
 void JKQTMathTextTextNode::fillStaticTables() {
+    static std::mutex sMutex;
+    std::lock_guard<std::mutex> lock(sMutex);
     if (blackboardUnicodeTable.size()>0) return;
 
-    blackboardUnicodeTable['C']=0x2102;
-    blackboardUnicodeTable['H']=0x210D;
-    blackboardUnicodeTable['N']=0x2115;
-    blackboardUnicodeTable['P']=0x2119;
-    blackboardUnicodeTable['Q']=0x211A;
-    blackboardUnicodeTable['R']=0x211D;
-    blackboardUnicodeTable['Z']=0x2124;
 
     for (const QChar ch: QString("ABDEFGIJKLMOSTUVWXYZ")) {
         blackboardUnicodeTable[ch]=0x1D538+(ch.unicode()-QChar('A').unicode());
@@ -95,6 +90,14 @@ void JKQTMathTextTextNode::fillStaticTables() {
     for (const QChar ch: QString("0123456789")) {
         blackboardUnicodeTable[ch]=0x1D7D8+(ch.unicode()-QChar('0').unicode());
     }
+
+    blackboardUnicodeTable['C']=0x2102;
+    blackboardUnicodeTable['H']=0x210D;
+    blackboardUnicodeTable['N']=0x2115;
+    blackboardUnicodeTable['P']=0x2119;
+    blackboardUnicodeTable['Q']=0x211A;
+    blackboardUnicodeTable['R']=0x211D;
+    blackboardUnicodeTable['Z']=0x2124;
 }
 
 JKQTMathTextTextNode::JKQTMathTextTextNode(JKQTMathText* _parent, const QString& textIn, bool addWhitespace, bool stripInnerWhitepace):
diff --git a/lib/jkqtmathtext/nodes/jkqtmathtextwhitespacenode.cpp b/lib/jkqtmathtext/nodes/jkqtmathtextwhitespacenode.cpp
index b7d779c2d2..fbca5d96d1 100644
--- a/lib/jkqtmathtext/nodes/jkqtmathtextwhitespacenode.cpp
+++ b/lib/jkqtmathtext/nodes/jkqtmathtextwhitespacenode.cpp
@@ -138,6 +138,8 @@ QHash<QString, JKQTMathTextWhitespaceNode::WhitespaceProps> JKQTMathTextWhitespa
 
 void JKQTMathTextWhitespaceNode::fillSupportedInstructions()
 {
+    static std::mutex sMutex;
+    std::lock_guard<std::mutex> lock(sMutex);
     if (supportedInstructions.size()==0) {
         supportedInstructions[" "]=WhitespaceProps(WSTthicker, 1);
         supportedInstructions["nbsp"]=WhitespaceProps(WSTNonbreaking, 1);
@@ -427,6 +429,9 @@ QHash<QString, JKQTMathTextPhantomNode::Mode> JKQTMathTextPhantomNode::instructi
 
 void JKQTMathTextPhantomNode::fillInstructions()
 {
+    static std::mutex sMutex;
+    std::lock_guard<std::mutex> lock(sMutex);
+    if (instructions.size()>0) return;
     instructions["phantom"] = FMwidthAndHeight;
     instructions["hphantom"] = FMwidth;
     instructions["vphantom"] = FMheight;
diff --git a/lib/jkqtmathtext/parsers/jkqtmathtextlatexparser.cpp b/lib/jkqtmathtext/parsers/jkqtmathtextlatexparser.cpp
index b13c502331..2348232a0f 100644
--- a/lib/jkqtmathtext/parsers/jkqtmathtextlatexparser.cpp
+++ b/lib/jkqtmathtext/parsers/jkqtmathtextlatexparser.cpp
@@ -60,6 +60,8 @@ QHash<QString,double> JKQTMathTextLatexParser::big_instructions_family;
 // define some static sets for easy character lookup/identificattion
 void JKQTMathTextLatexParser::initStaticStructures()
 {
+    static std::mutex sMutex;
+    std::lock_guard<std::mutex> lock(sMutex);
     if (accentLetters.size()==0) {
         auto fAddUml=[](const QString& cmd, const QChar& letter, const QChar& ch) {
             QString i;
diff --git a/lib/jkqtplotter/jkqtpbaseplotter.cpp b/lib/jkqtplotter/jkqtpbaseplotter.cpp
index 9a38b97fc2..c0402e40a0 100644
--- a/lib/jkqtplotter/jkqtpbaseplotter.cpp
+++ b/lib/jkqtplotter/jkqtpbaseplotter.cpp
@@ -53,15 +53,18 @@
 #include "jkqtmathtext/jkqtmathtext.h"
 #include <algorithm>
 
-static QString globalUserSettigsFilename="";
-static QString globalUserSettigsPrefix="";
-static QList<JKQTPPaintDeviceAdapter*> jkqtpPaintDeviceAdapters;
-static QList<JKQTPSaveDataAdapter*> jkqtpSaveDataAdapters;
+QString JKQTBasePlotter::globalUserSettigsFilename="";
+QString JKQTBasePlotter::globalUserSettigsPrefix="";
+std::mutex JKQTBasePlotter::globalUserSettingsMutex = std::mutex();
+JKQTPSynchronized<QList<JKQTPPaintDeviceAdapter*>> JKQTBasePlotter::jkqtpPaintDeviceAdapters;
+JKQTPSynchronized<QList<JKQTPSaveDataAdapter*>> JKQTBasePlotter::jkqtpSaveDataAdapters;
 
 
 
 void initJKQTBasePlotterResources()
 {
+    static std::mutex sMutex;
+    std::lock_guard<std::mutex> lock(sMutex);
     Q_INIT_RESOURCE(jkqtpbaseplotter);
     initJKQTMathTextResources();
 }
@@ -69,30 +72,34 @@ void initJKQTBasePlotterResources()
 
 void JKQTBasePlotter::setDefaultJKQTBasePrinterUserSettings(QString userSettigsFilename, const QString& userSettigsPrefix)
 {
+    std::lock_guard<std::mutex> lock(globalUserSettingsMutex);
     globalUserSettigsFilename=userSettigsFilename;
     globalUserSettigsPrefix=userSettigsPrefix;
 }
 
 void JKQTBasePlotter::registerPaintDeviceAdapter(JKQTPPaintDeviceAdapter *adapter)
 {
-    jkqtpPaintDeviceAdapters.append(adapter);
+    JKQTPSynchronized<QList<JKQTPPaintDeviceAdapter*>>::Locker lock(jkqtpPaintDeviceAdapters);
+    jkqtpPaintDeviceAdapters.get().append(adapter);
 }
 
 void JKQTBasePlotter::deregisterPaintDeviceAdapter(JKQTPPaintDeviceAdapter *adapter)
 {
-    if (jkqtpPaintDeviceAdapters.contains(adapter)) jkqtpPaintDeviceAdapters.removeAll(adapter);
+    JKQTPSynchronized<QList<JKQTPPaintDeviceAdapter*>>::Locker lock(jkqtpPaintDeviceAdapters);
+    if (jkqtpPaintDeviceAdapters.get().contains(adapter)) jkqtpPaintDeviceAdapters.get().removeAll(adapter);
 }
 
 bool JKQTBasePlotter::registerSaveDataAdapter(JKQTPSaveDataAdapter *adapter)
 {
     if (adapter){
+        JKQTPSynchronized<QList<JKQTPSaveDataAdapter*>>::Locker lock(jkqtpSaveDataAdapters);
         QString format=adapter->getFilter();
-        for (int i=0; i<jkqtpSaveDataAdapters.size(); i++) {
-            if (jkqtpSaveDataAdapters[i] && jkqtpSaveDataAdapters[i]->getFilter()==format) {
+        for (int i=0; i<jkqtpSaveDataAdapters.get().size(); i++) {
+            if (jkqtpSaveDataAdapters.get()[i] && jkqtpSaveDataAdapters.get()[i]->getFilter()==format) {
                 return false;
             }
         }
-        jkqtpSaveDataAdapters.append(adapter);
+        jkqtpSaveDataAdapters.get().append(adapter);
         return true;
     }
     return false;
@@ -100,10 +107,16 @@ bool JKQTBasePlotter::registerSaveDataAdapter(JKQTPSaveDataAdapter *adapter)
 
 bool JKQTBasePlotter::deregisterSaveDataAdapter(JKQTPSaveDataAdapter *adapter)
 {
-    if (jkqtpSaveDataAdapters.contains(adapter)) jkqtpSaveDataAdapters.removeAll(adapter);
+    JKQTPSynchronized<QList<JKQTPSaveDataAdapter*>>::Locker lock(jkqtpSaveDataAdapters);
+    if (jkqtpSaveDataAdapters.get().contains(adapter)) jkqtpSaveDataAdapters.get().removeAll(adapter);
     return true;
 }
 
+
+
+
+
+
 JKQTBasePlotter::textSizeData JKQTBasePlotter::getTextSizeDetail(const QFont &fm, const QString &text, QPainter& painter)
 {
     return getTextSizeDetail(fm.family(), fm.pointSizeF(), text, painter);
@@ -111,6 +124,7 @@ JKQTBasePlotter::textSizeData JKQTBasePlotter::getTextSizeDetail(const QFont &fm
 
 JKQTBasePlotter::textSizeData JKQTBasePlotter::getTextSizeDetail(const QString &fontName, double fontSize, const QString &text, QPainter& painter)
 {
+    thread_local QHash<JKQTBasePlotter::textSizeKey, JKQTBasePlotter::textSizeData> s_TextSizeDataCache;
     JKQTBasePlotter::textSizeKey  dh(fontName, fontSize, text, painter.device());
     if (s_TextSizeDataCache.contains(dh)) return s_TextSizeDataCache[dh];
     JKQTBasePlotter::textSizeData d;
@@ -185,8 +199,11 @@ JKQTBasePlotter::JKQTBasePlotter(bool datastore_internal, QObject* parent, JKQTP
     lineWidthPrintMultiplier=1;
     fontSizeMultiplier=1;
     lineWidthMultiplier=1;
-    userSettigsFilename=globalUserSettigsFilename;
-    userSettigsPrefix=globalUserSettigsPrefix;
+    {
+        std::lock_guard<std::mutex> lock(globalUserSettingsMutex);
+        userSettigsFilename=globalUserSettigsFilename;
+        userSettigsPrefix=globalUserSettigsPrefix;
+    }
 #ifndef JKQTPLOTTER_COMPILE_WITHOUT_PRINTSUPPORT
     currentPrinter=QPrinterInfo::defaultPrinter().printerName();
 #endif
@@ -3599,9 +3616,12 @@ void JKQTBasePlotter::saveData(const QString& filename, const QString &format) {
     fileformats<<tr("Matlab Script (*.m)");
     fileformatIDs<<"m";
 
-    for (int i=0; i<jkqtpSaveDataAdapters.size(); i++) {
-        fileformats<<jkqtpSaveDataAdapters[i]->getFilter();
-        fileformatIDs<<QString("custom%1").arg(i);
+    {
+        JKQTPSynchronized<QList<JKQTPSaveDataAdapter*>>::Locker lock(jkqtpSaveDataAdapters);
+        for (int i=0; i<jkqtpSaveDataAdapters.get().size(); i++) {
+            fileformats<<jkqtpSaveDataAdapters.get()[i]->getFilter();
+            fileformatIDs<<QString("custom%1").arg(i);
+        }
     }
 
 
@@ -3665,10 +3685,11 @@ void JKQTBasePlotter::saveData(const QString& filename, const QString &format) {
             QString fidx=fmt;
             fidx=fidx.remove(0,6);
             int idx=fidx.toInt();
-            if (idx>=0 && idx<jkqtpSaveDataAdapters.size() && jkqtpSaveDataAdapters[idx]) {
+            JKQTPSynchronized<QList<JKQTPSaveDataAdapter*>>::Locker lock(jkqtpSaveDataAdapters);
+            if (idx>=0 && idx<jkqtpSaveDataAdapters.get().size() && jkqtpSaveDataAdapters.get()[idx]) {
                 QStringList cn;
                 QList<QVector<double> > dataset=datastore->getData(&cn);
-                jkqtpSaveDataAdapters[idx]->saveJKQTPData(fn, dataset, cn);
+                jkqtpSaveDataAdapters.get()[idx]->saveJKQTPData(fn, dataset, cn);
             }
         }
     }
@@ -3849,8 +3870,11 @@ void JKQTBasePlotter::saveImage(const QString& filename, bool displayPreview) {
     filt<<tr("TIFF Image [Qt] (*.tif *.tiff)");
     filt<<tr("JPEG Image [Qt] (*.jpg *.jpeg)");
     const int filtStartSize=filt.size();
-    for (int i=0; i<jkqtpPaintDeviceAdapters.size(); i++) {
-        filt<<jkqtpPaintDeviceAdapters[i]->getFilter();
+    {
+        JKQTPSynchronized<QList<JKQTPPaintDeviceAdapter*>>::Locker lock(jkqtpPaintDeviceAdapters);
+        for (int i=0; i<jkqtpPaintDeviceAdapters.get().size(); i++) {
+            filt<<jkqtpPaintDeviceAdapters.get()[i]->getFilter();
+        }
     }
     int qtwritersidx=filt.size();
     QList<QByteArray> writerformats=QImageWriter::supportedImageFormats();
@@ -3874,12 +3898,14 @@ void JKQTBasePlotter::saveImage(const QString& filename, bool displayPreview) {
     saveUserSettings();
     if (!fn.isEmpty()) {
         int filtID=filt.indexOf(selFormat);
-        bool isWithSpecialDeviceAdapter=filtID>=filtStartSize && filtID<filtStartSize+jkqtpPaintDeviceAdapters.size();
+        JKQTPSynchronized<QList<JKQTPPaintDeviceAdapter*>>::Locker lock(jkqtpPaintDeviceAdapters);
+
+        bool isWithSpecialDeviceAdapter=filtID>=filtStartSize && filtID<filtStartSize+jkqtpPaintDeviceAdapters.get().size();
         int adapterID=filtID-filtStartSize;
         QString e=QFileInfo(filename).suffix().toLower();
         if (!isWithSpecialDeviceAdapter) {
-            for (int i=0; i<jkqtpPaintDeviceAdapters.size(); i++) {
-                if (jkqtpPaintDeviceAdapters[i]->getFileExtension().contains(e)) {
+            for (int i=0; i<jkqtpPaintDeviceAdapters.get().size(); i++) {
+                if (jkqtpPaintDeviceAdapters.get()[i]->getFileExtension().contains(e)) {
                     adapterID=i;
                     isWithSpecialDeviceAdapter=true;
                     break;
@@ -3897,7 +3923,7 @@ void JKQTBasePlotter::saveImage(const QString& filename, bool displayPreview) {
             return;
         }
 #endif
-        if (isWithSpecialDeviceAdapter && adapterID>=0 && adapterID<jkqtpPaintDeviceAdapters.size()) {
+        if (isWithSpecialDeviceAdapter && adapterID>=0 && adapterID<jkqtpPaintDeviceAdapters.get().size()) {
             QString tempFM="";
             if (QFile::exists(fn)) {
 #ifdef QFWIDLIB_LIBRARY
@@ -3916,10 +3942,10 @@ void JKQTBasePlotter::saveImage(const QString& filename, bool displayPreview) {
             emit beforeExporting();; auto __finalpaint=JKQTPFinally([&]() { emit afterExporting();});
 
             gridPrintingCalc();
-            QPaintDevice* paintDevice=jkqtpPaintDeviceAdapters[adapterID]->createPaintdevice(fn, jkqtp_roundTo<int>(gridPrintingSize.width()), jkqtp_roundTo<int>(gridPrintingSize.height()));
+            QPaintDevice* paintDevice=jkqtpPaintDeviceAdapters.get()[adapterID]->createPaintdevice(fn, jkqtp_roundTo<int>(gridPrintingSize.width()), jkqtp_roundTo<int>(gridPrintingSize.height()));
 
 #ifndef JKQTPLOTTER_COMPILE_WITHOUT_PRINTSUPPORT
-            if (!printpreviewNew(paintDevice, jkqtpPaintDeviceAdapters[adapterID]->getSetAbsolutePaperSize(), jkqtpPaintDeviceAdapters[adapterID]->getPrintSizeXInMM(), jkqtpPaintDeviceAdapters[adapterID]->getPrintSizeYInMM(), displayPreview)) {
+            if (!printpreviewNew(paintDevice, jkqtpPaintDeviceAdapters.get()[adapterID]->getSetAbsolutePaperSize(), jkqtpPaintDeviceAdapters.get()[adapterID]->getPrintSizeXInMM(), jkqtpPaintDeviceAdapters.get()[adapterID]->getPrintSizeYInMM(), displayPreview)) {
                 delete paintDevice;
 
 
@@ -3932,7 +3958,7 @@ void JKQTBasePlotter::saveImage(const QString& filename, bool displayPreview) {
             {
 #endif
                 delete paintDevice;
-                paintDevice=jkqtpPaintDeviceAdapters[adapterID]->createPaintdeviceMM(fn,printSizeX_Millimeter,printSizeY_Millimeter);
+                paintDevice=jkqtpPaintDeviceAdapters.get()[adapterID]->createPaintdeviceMM(fn,printSizeX_Millimeter,printSizeY_Millimeter);
                 printpreviewPaintRequestedNewPaintDevice(paintDevice);
                 delete paintDevice;
             }
@@ -5299,7 +5325,6 @@ void JKQTBasePlotter::setEmittingSignalsEnabled(bool enabled)
 }
 
 
-QHash<JKQTBasePlotter::textSizeKey, JKQTBasePlotter::textSizeData> JKQTBasePlotter::s_TextSizeDataCache=QHash<JKQTBasePlotter::textSizeKey, JKQTBasePlotter::textSizeData>();
 
 JKQTBasePlotter::textSizeKey::textSizeKey(const QFont &f, const QString &text, QPaintDevice *pd):
     text(), f(), ldpiX(0), ldpiY(0), pdpiX(0), pdpiY(0)
diff --git a/lib/jkqtplotter/jkqtpbaseplotter.h b/lib/jkqtplotter/jkqtpbaseplotter.h
index acb4917c72..415b432453 100644
--- a/lib/jkqtplotter/jkqtpbaseplotter.h
+++ b/lib/jkqtplotter/jkqtpbaseplotter.h
@@ -28,6 +28,7 @@
 #include "jkqtmathtext/jkqtmathtext.h"
 #include "jkqtplotter/jkqtpbaseelements.h"
 #include "jkqtcommon/jkqtpenhancedpainter.h"
+#include "jkqtcommon/jkqtpconcurrencytools.h"
 #include "jkqtplotter/gui/jkqtpenhancedspinboxes.h"
 
 #include <QObject>
@@ -2032,8 +2033,6 @@ class JKQTPLOTTER_LIB_EXPORT JKQTBasePlotter: public QObject {
          */
         void enableDebugShowTextBoxes(bool enabled=true);
     protected:
-        /** \brief this is a cache for JKQTBasePlotter::textSizeData calculated with JKQTBasePlotter::getTextSizeDetail() */
-        static QHash<JKQTBasePlotter::textSizeKey, JKQTBasePlotter::textSizeData> s_TextSizeDataCache;
 
 
 
@@ -2595,6 +2594,11 @@ class JKQTPLOTTER_LIB_EXPORT JKQTBasePlotter: public QObject {
         bool emitPlotSignals;
 
 
+        static QString globalUserSettigsFilename;
+        static QString globalUserSettigsPrefix;
+        static std::mutex globalUserSettingsMutex;
+        static JKQTPSynchronized<QList<JKQTPPaintDeviceAdapter*>> jkqtpPaintDeviceAdapters;
+        static JKQTPSynchronized<QList<JKQTPSaveDataAdapter*>> jkqtpSaveDataAdapters;