diff --git a/test/jkqtmathtext_test/testform.cpp b/test/jkqtmathtext_test/testform.cpp
index 5a5badc824..ff530cabbc 100644
--- a/test/jkqtmathtext_test/testform.cpp
+++ b/test/jkqtmathtext_test/testform.cpp
@@ -110,6 +110,7 @@ TestForm::TestForm(QWidget *parent) :
     ui->cmbTestset->addItem(QLatin1String("Schrödinger's equation"), "$\\left[-\\frac{\\hbar^2}{2m}\\frac{\\partial^2}{\\partial x^2}+V\\right]\\Psi(x)=\\mathrm{i}\\hbar\\frac{\\partial}{\\partial t}\\Psi(x)$");
     ui->cmbTestset->addItem("Cauchy-Schwarz inequality", "$\\left( \\sum_{k=1}^n a_k b_k \\right)^2 \\leq \\left( \\sum_{k=1}^n a_k^2 \\right) \\left( \\sum_{k=1}^n b_k^2 \\right)$");
     ui->cmbTestset->addItem("Maxwell's equations", "$\\begin{aligned}\\nabla \\times \\vec{\\mathbf{B}} -\\, \\frac{1}{c}\\, \\frac{\\partial\\vec{\\mathbf{E}}}{\\partial t} & = \\frac{4\\pi}{c}\\vec{\\mathbf{j}} \\\\   \\nabla \\cdot \\vec{\\mathbf{E}} & = 4 \\pi \\rho \\\\\\nabla \\times \\vec{\\mathbf{E}}\\, +\\, \\frac{1}{c}\\, \\frac{\\partial\\vec{\\mathbf{B}}}{\\partial t} & = \\vec{\\mathbf{0}} \\\\\\nabla \\cdot \\vec{\\mathbf{B}} & = 0 \\end{aligned}$");
+    ui->cmbTestset->addItem("User-Editable Text");
     //ui->cmbTestset->addItem("", "$$");
     //ui->cmbTestset->addItem("", "$$");
     //ui->cmbTestset->addItem("", "$$");
@@ -132,7 +133,7 @@ TestForm::~TestForm()
 
 
 
-double TestForm::draw(QPainter& painter, double X, double YY, JKQTmathText& mt, QString name) {
+double TestForm::draw(QPainter& painter, double X, double YY, JKQTmathText& mt, QString name, double& durationSizingMS, double&durationTimingMS) {
 
 
     double Y=YY;
@@ -140,7 +141,8 @@ double TestForm::draw(QPainter& painter, double X, double YY, JKQTmathText& mt,
     ht.start();
     QSizeF s=mt.getSize(painter);
     Y=Y+mt.getAscent(painter);
-    qDebug()<<"    sizing in "<<ht.get_time()/1000.0<<" ms\n";
+    durationSizingMS=ht.get_time()/1000.0;
+    qDebug()<<"    sizing in "<<durationSizingMS<<" ms\n";
     QPen p=painter.pen();
     p.setColor("lightcoral");
     p.setStyle(Qt::DashLine);
@@ -157,7 +159,8 @@ double TestForm::draw(QPainter& painter, double X, double YY, JKQTmathText& mt,
     p.setColor("black");
     painter.setPen(p);
     mt.draw(painter, X, Y, ui->chkBoxes->isChecked());
-    qDebug()<<"   drawing in "<<ht.get_time()/1000.0<<" ms";
+    durationTimingMS=ht.get_time()/1000.0;
+    qDebug()<<"   drawing in "<<durationTimingMS<<" ms";
     p.setColor("blue");
     painter.setPen(p);
 
@@ -188,7 +191,7 @@ QTreeWidgetItem *TestForm::createTree(JKQTmathText::MTnode *node, QTreeWidgetIte
     JKQTmathText::MTmatrixNode* matrixN=dynamic_cast<JKQTmathText::MTmatrixNode*>(node);
     JKQTmathText::MTdecoratedNode* decoN=dynamic_cast<JKQTmathText::MTdecoratedNode*>(node);
 
-    QTreeWidgetItem* ti=NULL;
+    QTreeWidgetItem* ti=nullptr;
     if (parent) ti=new QTreeWidgetItem(parent);
     else ti=new QTreeWidgetItem(ui->tree);
 
@@ -202,7 +205,7 @@ QTreeWidgetItem *TestForm::createTree(JKQTmathText::MTnode *node, QTreeWidgetIte
         QVector<QVector<JKQTmathText::MTnode*> > children=matrixN->get_children();
         for (int y=0; y<l; y++) {
             for (int x=0; x<c; x++) {
-                if (children[y].at(x)!=NULL) {
+                if (children[y].at(x)!=nullptr) {
                     QTreeWidgetItem* it=createTree(children[y].at(x), ti);
                     it->setText(0, QString("(%1,%2):").arg(y).arg(x)+it->text(0));
                     ti->addChild(it);
@@ -274,9 +277,16 @@ void TestForm::updateMath()
 
     //QString text="x_0My Text$\\sqrt{a^2+b^2 } \\underbrace{underbrace}{x_0}$";
 
-    mathTest=ui->cmbTestset->itemData(ui->cmbTestset->currentIndex()).toString();
-
-    ui->textBrowserSource->setPlainText(mathTest);
+    if (ui->cmbTestset->currentIndex()==ui->cmbTestset->count()-1) {
+        mathTest=ui->textBrowserSource->toPlainText();
+        ui->textBrowserSource->setReadOnly(false);
+        ui->btnRender->setEnabled(true);
+    } else {
+        mathTest=ui->cmbTestset->itemData(ui->cmbTestset->currentIndex()).toString();
+        ui->textBrowserSource->setPlainText(mathTest);
+        ui->textBrowserSource->setReadOnly(true);
+        ui->btnRender->setEnabled(false);
+    }
 
     ui->scrollArea->setBackgroundRole(QPalette::Dark);
 
@@ -313,24 +323,32 @@ void TestForm::updateMath()
     }
 
     ui->tree->clear();
+    ht.start();
+    double durationParse=0;
     if (mt.parse(mathTest)) {
+        durationParse=ht.get_time()/1000.0;
         ui->tree->addTopLevelItem(createTree(mt.get_parsedNode()));
+    } else {
+        durationParse=ht.get_time()/1000.0;
     }
+    ui->labParsingTimes->setText(QString("   %1ms").arg(durationParse, 0, 'f', 3));
     ui->tree->expandAll();
     bool okh=true;
     ui->textBrowser->clear();
     qDebug()<<"parse mathTest in "<<ht.get_time()/1000.0<<" ms\n";
 
     QStringList sl=ui->edtSizes->text().split(",");
+    ui->labRenderTimes->setText("");
 
     for (int i=0; i<sl.size(); i++) {
         bool ok=true;
         int size=sl[i].trimmed().toUInt(&ok);
         if (!ok) size=10+i*5;
         mt.set_fontSize(size);
-        Y+=draw(painter, X1, Y, mt, QString("%1, %2, %3pt").arg(ui->cmbTestset->currentText()).arg(ui->cmbFont->currentText()).arg(size));
-
+        double durationSizingMS=0, durationTimingMS=0;
+        Y+=draw(painter, X1, Y, mt, QString("%1, %2, %3pt").arg(ui->cmbTestset->currentText()).arg(ui->cmbFont->currentText()).arg(size), durationSizingMS, durationTimingMS);
 
+        ui->labRenderTimes->setText(ui->labRenderTimes->text()+QString("     %1pt: %2ms/%3ms").arg(size).arg(durationSizingMS, 0, 'F', 1).arg(durationTimingMS, 0, 'F', 1));
         ui->textBrowser->textCursor().insertHtml("<hr>"+mt.toHtml(&okh)+"<hr><br><br>");
         qDebug()<<"HTML: ---------------------------------------------\n"<<mt.toHtml(&okh)<<"\nHTML: --------------------------------------------- ok="<<okh;
         if (mt.get_error_list().size()>0) {
@@ -342,5 +360,5 @@ void TestForm::updateMath()
 
 
     ui->label->setPixmap(pix);
-     QApplication::restoreOverrideCursor();
+    QApplication::restoreOverrideCursor();
 }
diff --git a/test/jkqtmathtext_test/testform.h b/test/jkqtmathtext_test/testform.h
index efca8741c7..ef96bda633 100644
--- a/test/jkqtmathtext_test/testform.h
+++ b/test/jkqtmathtext_test/testform.h
@@ -26,7 +26,7 @@ class TestForm : public QWidget
     private:
         Ui::TestForm *ui;
         JKQTPHighResTimer ht;
-        double draw(QPainter& painter, double X, double YY, JKQTmathText& mt, QString name);
+        double draw(QPainter& painter, double X, double YY, JKQTmathText& mt, QString name, double &durationSizingMS, double &durationTimingMS);
 
         QTreeWidgetItem* createTree(JKQTmathText::MTnode* node, QTreeWidgetItem *parent=NULL);
 };
diff --git a/test/jkqtmathtext_test/testform.ui b/test/jkqtmathtext_test/testform.ui
index cb25fca848..cba39fc882 100644
--- a/test/jkqtmathtext_test/testform.ui
+++ b/test/jkqtmathtext_test/testform.ui
@@ -14,7 +14,7 @@
    <string>Form</string>
   </property>
   <layout class="QGridLayout" name="gridLayout">
-   <item row="4" column="0" rowspan="5">
+   <item row="4" column="0" rowspan="11">
     <widget class="QScrollArea" name="scrollArea">
      <property name="widgetResizable">
       <bool>true</bool>
@@ -25,7 +25,7 @@
         <x>0</x>
         <y>0</y>
         <width>605</width>
-        <height>628</height>
+        <height>616</height>
        </rect>
       </property>
       <layout class="QHBoxLayout" name="horizontalLayout">
@@ -43,10 +43,16 @@
      </widget>
     </widget>
    </item>
-   <item row="4" column="1">
-    <widget class="QTextBrowser" name="textBrowserSource">
-     <property name="verticalScrollBarPolicy">
-      <enum>Qt::ScrollBarAlwaysOff</enum>
+   <item row="11" column="1">
+    <widget class="QLabel" name="label_12">
+     <property name="font">
+      <font>
+       <weight>75</weight>
+       <bold>true</bold>
+      </font>
+     </property>
+     <property name="text">
+      <string>render times (getSize()+getAscent()/draw()):</string>
      </property>
     </widget>
    </item>
@@ -186,6 +192,86 @@
      </item>
     </layout>
    </item>
+   <item row="15" column="0" colspan="2">
+    <widget class="JKQTMathTextLabel" name="labMath">
+     <property name="text">
+      <string>left(left[sqrt{2picdotint_{-infty}^infty f(x);mathrm{d}x}right]right) </string>
+     </property>
+    </widget>
+   </item>
+   <item row="3" column="1">
+    <layout class="QHBoxLayout" name="horizontalLayout_4">
+     <item>
+      <widget class="QLabel" name="label_8">
+       <property name="font">
+        <font>
+         <weight>75</weight>
+         <bold>true</bold>
+        </font>
+       </property>
+       <property name="text">
+        <string>LaTeX source:</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <spacer name="horizontalSpacer_3">
+       <property name="orientation">
+        <enum>Qt::Horizontal</enum>
+       </property>
+       <property name="sizeHint" stdset="0">
+        <size>
+         <width>40</width>
+         <height>20</height>
+        </size>
+       </property>
+      </spacer>
+     </item>
+     <item>
+      <widget class="QPushButton" name="btnRender">
+       <property name="enabled">
+        <bool>false</bool>
+       </property>
+       <property name="text">
+        <string>&amp;Render</string>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
+   <item row="4" column="1" rowspan="2">
+    <widget class="QPlainTextEdit" name="textBrowserSource">
+     <property name="readOnly">
+      <bool>true</bool>
+     </property>
+    </widget>
+   </item>
+   <item row="3" column="0">
+    <widget class="QLabel" name="label_11">
+     <property name="font">
+      <font>
+       <weight>75</weight>
+       <bold>true</bold>
+      </font>
+     </property>
+     <property name="text">
+      <string>rendered result:</string>
+     </property>
+    </widget>
+   </item>
+   <item row="7" column="1">
+    <widget class="QLabel" name="label_9">
+     <property name="font">
+      <font>
+       <weight>75</weight>
+       <bold>true</bold>
+      </font>
+     </property>
+     <property name="text">
+      <string>HTML output:</string>
+     </property>
+    </widget>
+   </item>
    <item row="1" column="0" colspan="2">
     <layout class="QHBoxLayout" name="horizontalLayout_3">
      <item>
@@ -266,7 +352,17 @@
      </item>
     </layout>
    </item>
+   <item row="12" column="1">
+    <widget class="QLabel" name="labRenderTimes">
+     <property name="text">
+      <string/>
+     </property>
+    </widget>
+   </item>
    <item row="8" column="1">
+    <widget class="QTextBrowser" name="textBrowser"/>
+   </item>
+   <item row="14" column="1">
     <widget class="QTreeWidget" name="tree">
      <property name="headerHidden">
       <bool>true</bool>
@@ -278,41 +374,36 @@
      </column>
     </widget>
    </item>
-   <item row="6" column="1">
-    <widget class="QTextBrowser" name="textBrowser"/>
-   </item>
-   <item row="5" column="1">
-    <widget class="QLabel" name="label_9">
-     <property name="text">
-      <string>HTML output:</string>
-     </property>
-    </widget>
-   </item>
-   <item row="7" column="1">
+   <item row="13" column="1">
     <widget class="QLabel" name="label_10">
+     <property name="font">
+      <font>
+       <weight>75</weight>
+       <bold>true</bold>
+      </font>
+     </property>
      <property name="text">
       <string>node tree:</string>
      </property>
     </widget>
    </item>
-   <item row="3" column="1">
-    <widget class="QLabel" name="label_8">
+   <item row="9" column="1">
+    <widget class="QLabel" name="label_13">
+     <property name="font">
+      <font>
+       <weight>75</weight>
+       <bold>true</bold>
+      </font>
+     </property>
      <property name="text">
-      <string>LaTeX source:</string>
+      <string>parsing times:</string>
      </property>
     </widget>
    </item>
-   <item row="3" column="0">
-    <widget class="QLabel" name="label_11">
+   <item row="10" column="1">
+    <widget class="QLabel" name="labParsingTimes">
      <property name="text">
-      <string>rendered result:</string>
-     </property>
-    </widget>
-   </item>
-   <item row="9" column="0" colspan="2">
-    <widget class="JKQTMathTextLabel" name="labMath">
-     <property name="text">
-      <string>left(left[sqrt{2picdotint_{-infty}^infty f(x);mathrm{d}x}right]right) </string>
+      <string/>
      </property>
     </widget>
    </item>
@@ -366,7 +457,7 @@
    <slot>updateMath()</slot>
    <hints>
     <hint type="sourcelabel">
-     <x>591</x>
+     <x>790</x>
      <y>27</y>
     </hint>
     <hint type="destinationlabel">
@@ -382,7 +473,7 @@
    <slot>updateMath()</slot>
    <hints>
     <hint type="sourcelabel">
-     <x>669</x>
+     <x>868</x>
      <y>27</y>
     </hint>
     <hint type="destinationlabel">
@@ -398,7 +489,7 @@
    <slot>updateMath()</slot>
    <hints>
     <hint type="sourcelabel">
-     <x>765</x>
+     <x>964</x>
      <y>27</y>
     </hint>
     <hint type="destinationlabel">
@@ -414,7 +505,7 @@
    <slot>updateMath()</slot>
    <hints>
     <hint type="sourcelabel">
-     <x>867</x>
+     <x>1067</x>
      <y>27</y>
     </hint>
     <hint type="destinationlabel">
@@ -430,7 +521,7 @@
    <slot>updateMath()</slot>
    <hints>
     <hint type="sourcelabel">
-     <x>520</x>
+     <x>679</x>
      <y>29</y>
     </hint>
     <hint type="destinationlabel">
@@ -510,8 +601,8 @@
    <slot>updateMath()</slot>
    <hints>
     <hint type="sourcelabel">
-     <x>697</x>
-     <y>45</y>
+     <x>949</x>
+     <y>57</y>
     </hint>
     <hint type="destinationlabel">
      <x>518</x>
@@ -526,8 +617,8 @@
    <slot>updateMath()</slot>
    <hints>
     <hint type="sourcelabel">
-     <x>941</x>
-     <y>54</y>
+     <x>1221</x>
+     <y>57</y>
     </hint>
     <hint type="destinationlabel">
      <x>520</x>
@@ -542,8 +633,8 @@
    <slot>updateMath()</slot>
    <hints>
     <hint type="sourcelabel">
-     <x>905</x>
-     <y>22</y>
+     <x>1181</x>
+     <y>27</y>
     </hint>
     <hint type="destinationlabel">
      <x>519</x>
@@ -551,6 +642,22 @@
     </hint>
    </hints>
   </connection>
+  <connection>
+   <sender>btnRender</sender>
+   <signal>clicked()</signal>
+   <receiver>TestForm</receiver>
+   <slot>updateMath()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>1187</x>
+     <y>83</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>617</x>
+     <y>380</y>
+    </hint>
+   </hints>
+  </connection>
  </connections>
  <slots>
   <slot>updateMath()</slot>