diff --git a/src/common/DevSettingsHandler.cxx b/src/common/DevSettingsHandler.cxx
index c33e22340..c457c16d8 100644
--- a/src/common/DevSettingsHandler.cxx
+++ b/src/common/DevSettingsHandler.cxx
@@ -24,6 +24,7 @@
 #include "StateManager.hxx"
 #include "TIA.hxx"
 #include "Cart.hxx"
+#include "CartELF.hxx"
 
 #include "DevSettingsHandler.hxx"
 
@@ -62,7 +63,7 @@ void DevSettingsHandler::loadSettings(SettingsSet set)
 #endif
   // Thumb ARM emulation exception
   myThumbException[set] = devSettings ? settings.getBool("dev.thumb.trapfatal") : false;
-  myArmSpeed[set] = devSettings ? settings.getInt("dev.arm.mips") : 250; // TODO: use constant
+  myArmSpeed[set] = devSettings ? settings.getInt("dev.arm.mips") : CartridgeELF::MIPS_MAX;
 
   // TIA tab
   myTIAType[set] = devSettings ? settings.getString("dev.tia.type") : "standard";
diff --git a/src/emucore/CartELF.hxx b/src/emucore/CartELF.hxx
index 9b3d496d5..bda7d121b 100644
--- a/src/emucore/CartELF.hxx
+++ b/src/emucore/CartELF.hxx
@@ -31,7 +31,8 @@ class ElfLinker;
 class CartridgeELF: public Cartridge {
   public:
     static constexpr uInt32 MIPS_MAX = 300;
-    static constexpr uInt32 MIPS_MIN = 50;
+    static constexpr uInt32 MIPS_MIN = 50; 
+    static constexpr uInt32 MIPS_DEF = 150;
 
   public:
     CartridgeELF(const ByteBuffer& image, size_t size, string_view md5,
diff --git a/src/emucore/Settings.cxx b/src/emucore/Settings.cxx
index 438163620..8dd3c12eb 100644
--- a/src/emucore/Settings.cxx
+++ b/src/emucore/Settings.cxx
@@ -24,6 +24,7 @@
 #include "PaletteHandler.hxx"
 #include "Joystick.hxx"
 #include "Paddles.hxx"
+#include "CartELF.hxx"
 #ifdef GUI_SUPPORT
   #include "JitterEmulation.hxx"
 #endif
@@ -311,7 +312,7 @@ Settings::Settings()
   setPermanent("dev.extaccess", "true");
   // Thumb ARM emulation options
   setPermanent("dev.thumb.trapfatal", "true");
-  setPermanent("dev.arm.mips", "150"); // TODO: use constant
+  setPermanent("dev.arm.mips", CartridgeELF::MIPS_DEF); 
 #ifdef DEBUGGER_SUPPORT
   setPermanent("dev.thumb.inccycles", "true");
   setPermanent("dev.thumb.cyclefactor", "1.05");
diff --git a/src/gui/DeveloperDialog.cxx b/src/gui/DeveloperDialog.cxx
index 365486a33..282a62726 100644
--- a/src/gui/DeveloperDialog.cxx
+++ b/src/gui/DeveloperDialog.cxx
@@ -229,9 +229,9 @@ void DeveloperDialog::addEmulationTab(const GUI::Font& font)
   myArmSpeedWidget = new SliderWidget(myTab, font, HBORDER + INDENT * 1, ypos - 1,
                                       fontWidth * 10, lineHeight, "Limit ARM speed (*) ",
                                       0, kArmSpeedChanged, fontWidth * 9, " MIPS");
-  myArmSpeedWidget->setMinValue(CartridgeELF::MIPS_MIN); // TODO: use constant
-  myArmSpeedWidget->setMaxValue(CartridgeELF::MIPS_MAX); // TODO: use constant
-  myArmSpeedWidget->setTickmarkIntervals(4);
+  myArmSpeedWidget->setMinValue(CartridgeELF::MIPS_MIN); 
+  myArmSpeedWidget->setMaxValue(CartridgeELF::MIPS_MAX); 
+  myArmSpeedWidget->setTickmarkIntervals((CartridgeELF::MIPS_MAX - CartridgeELF::MIPS_MIN) / 50);
   myArmSpeedWidget->setStepValue(2);
   myArmSpeedWidget->setToolTip("Limit emulation speed to simulate ARM CPU used for ELF.");
   wid.push_back(myArmSpeedWidget);
@@ -959,7 +959,7 @@ void DeveloperDialog::setDefaults()
     #endif
       // Thumb ARM emulation exception
       myThumbException[set] = devSettings;
-      myArmSpeed[set] = devSettings ? 150 : 250;
+      myArmSpeed[set] = devSettings ? CartridgeELF::MIPS_DEF : CartridgeELF::MIPS_MAX;
 
       setWidgetStates(set);
       break;