diff --git a/novelwriter/gui/doceditor.py b/novelwriter/gui/doceditor.py
index bc526608..9b4cd827 100644
--- a/novelwriter/gui/doceditor.py
+++ b/novelwriter/gui/doceditor.py
@@ -1139,7 +1139,7 @@ class GuiDocEditor(QPlainTextEdit):
 
         if time() - self._lastEdit < 5 * self.wcInterval:
             logger.debug("Running word counter")
-            self.mainGui.threadPool.start(self.wCounterDoc)
+            SHARED.runInThreadPool(self.wCounterDoc)
 
         return
 
@@ -1192,7 +1192,7 @@ class GuiDocEditor(QPlainTextEdit):
             logger.debug("Selection word counter is busy")
             return
 
-        self.mainGui.threadPool.start(self.wCounterSel)
+        SHARED.runInThreadPool(self.wCounterSel)
 
         return
 
diff --git a/novelwriter/gui/editordocument.py b/novelwriter/gui/editordocument.py
index 40b15288..434f3914 100644
--- a/novelwriter/gui/editordocument.py
+++ b/novelwriter/gui/editordocument.py
@@ -51,10 +51,19 @@ class GuiTextDocument(QTextDocument):
         logger.debug("Delete: GuiTextDocument")
         return
 
+    ##
+    #  Properties
+    ##
+
     @property
     def syntaxHighlighter(self) -> GuiDocHighlighter:
+        """Return the document's syntax highlighter object."""
         return self._syntax
 
+    ##
+    #  Metods
+    ##
+
     def setTextContent(self, text: str, tHandle: str) -> None:
         """Set the text content of the document."""
         self._syntax.setHandle(tHandle)
diff --git a/novelwriter/guimain.py b/novelwriter/guimain.py
index feafec69..b19f585f 100644
--- a/novelwriter/guimain.py
+++ b/novelwriter/guimain.py
@@ -30,7 +30,7 @@ from time import time
 from pathlib import Path
 from datetime import datetime
 
-from PyQt5.QtCore import Qt, QTimer, QThreadPool, pyqtSlot
+from PyQt5.QtCore import Qt, QTimer, pyqtSlot
 from PyQt5.QtGui import QCloseEvent, QCursor, QIcon, QKeySequence
 from PyQt5.QtWidgets import (
     QDialog, QFileDialog, QHBoxLayout, QMainWindow, QMessageBox, QShortcut,
@@ -95,7 +95,6 @@ class GuiMain(QMainWindow):
 
         logger.debug("Create: GUI")
         self.setObjectName("GuiMain")
-        self.threadPool = QThreadPool(self)
 
         # System Info
         # ===========
diff --git a/novelwriter/shared.py b/novelwriter/shared.py
index 2a186a75..b5e6d4fd 100644
--- a/novelwriter/shared.py
+++ b/novelwriter/shared.py
@@ -29,7 +29,7 @@ from time import time
 from typing import TYPE_CHECKING
 from pathlib import Path
 
-from PyQt5.QtCore import QObject, pyqtSignal
+from PyQt5.QtCore import QObject, QRunnable, QThreadPool, pyqtSignal
 from PyQt5.QtWidgets import QMessageBox, QWidget
 
 from novelwriter.core.spellcheck import NWSpellEnchant
@@ -55,14 +55,23 @@ class SharedData(QObject):
 
     def __init__(self) -> None:
         super().__init__()
+
+        # Objects
         self._gui = None
         self._theme = None
         self._project = None
         self._spelling = None
+
+        # Settings
         self._lockedBy = None
         self._alert = None
         self._idleTime = 0.0
         self._idleRefTime = time()
+
+        # Threading
+        self._threadPool = QThreadPool(self)
+        self._threadPool.setMaxThreadCount(5)
+
         return
 
     ##
@@ -199,6 +208,11 @@ class SharedData(QObject):
         self.projectStatusChanged.emit(state)
         return
 
+    def runInThreadPool(self, runnable: QRunnable, priority: int = 0) -> None:
+        """Queue a runnable in the application thread pool."""
+        self._threadPool.start(runnable, priority=priority)
+        return
+
     ##
     #  Alert Boxes
     ##
diff --git a/tests/test_gui/test_gui_doceditor.py b/tests/test_gui/test_gui_doceditor.py
index 8bee4ab4..276bafa5 100644
--- a/tests/test_gui/test_gui_doceditor.py
+++ b/tests/test_gui/test_gui_doceditor.py
@@ -1100,13 +1100,14 @@ def testGuiEditor_WordCounters(qtbot, monkeypatch, nwGUI, projPath, ipsumText, m
         def __init__(self):
             self._objID = None
 
-        def start(self, runObj):
+        def start(self, runObj, priority=0):
             self._objID = id(runObj)
 
         def objectID(self):
             return self._objID
 
-    nwGUI.threadPool = MockThreadPool()
+    threadPool = MockThreadPool()
+    monkeypatch.setattr(SHARED, "_threadPool", threadPool)
     nwGUI.docEditor.wcTimerDoc.blockSignals(True)
     nwGUI.docEditor.wcTimerSel.blockSignals(True)
 
@@ -1145,7 +1146,7 @@ def testGuiEditor_WordCounters(qtbot, monkeypatch, nwGUI, projPath, ipsumText, m
 
     # Run the full word counter
     nwGUI.docEditor._runDocCounter()
-    assert nwGUI.threadPool.objectID() == id(nwGUI.docEditor.wCounterDoc)
+    assert SHARED._threadPool.objectID() == id(nwGUI.docEditor.wCounterDoc)
 
     nwGUI.docEditor.wCounterDoc.run()
     # nwGUI.docEditor._updateDocCounts(cC, wC, pC)
@@ -1161,7 +1162,7 @@ def testGuiEditor_WordCounters(qtbot, monkeypatch, nwGUI, projPath, ipsumText, m
 
     # Run the selection word counter
     nwGUI.docEditor._runSelCounter()
-    assert nwGUI.threadPool.objectID() == id(nwGUI.docEditor.wCounterSel)
+    assert SHARED._threadPool.objectID() == id(nwGUI.docEditor.wCounterSel)
 
     nwGUI.docEditor.wCounterSel.run()
     # nwGUI.docEditor._updateSelCounts(cC, wC, pC)