diff --git a/Minecraft.Client/Common/UI/IUIScene_AbstractContainerMenu.cpp b/Minecraft.Client/Common/UI/IUIScene_AbstractContainerMenu.cpp
index 918bd8e6..7c6d3c9c 100644
--- a/Minecraft.Client/Common/UI/IUIScene_AbstractContainerMenu.cpp
+++ b/Minecraft.Client/Common/UI/IUIScene_AbstractContainerMenu.cpp
@@ -29,6 +29,7 @@ IUIScene_AbstractContainerMenu::IUIScene_AbstractContainerMenu()
 	m_pointerPos.y = 0.0f;
 	m_bPointerDrivenByMouse = false;
 
+	m_iLastMouseTickTimeNs = -1;
 }
 
 IUIScene_AbstractContainerMenu::~IUIScene_AbstractContainerMenu()
@@ -266,6 +267,21 @@ void IUIScene_AbstractContainerMenu::UpdateTooltips()
 
 void IUIScene_AbstractContainerMenu::onMouseTick()
 {
+	// Frame-rate independent cursor input, normalized to a 60Hz reference frame.
+	const int64_t kRefFrameNs = 1000000000LL / 60;
+	const int64_t kMinDeltaNs = 1000000LL;
+	const int64_t kMaxDeltaNs = 100000000LL;
+	int64_t iNowNs = System::nanoTime();
+	float fFrameScale = 1.0f;
+	if ( m_iLastMouseTickTimeNs > 0 )
+	{
+		int64_t iDeltaNs = iNowNs - m_iLastMouseTickTimeNs;
+		if ( iDeltaNs < kMinDeltaNs ) iDeltaNs = kMinDeltaNs;
+		if ( iDeltaNs > kMaxDeltaNs ) iDeltaNs = kMaxDeltaNs;
+		fFrameScale = static_cast<float>(iDeltaNs) / static_cast<float>(kRefFrameNs);
+	}
+	m_iLastMouseTickTimeNs = iNowNs;
+
 	Minecraft *pMinecraft = Minecraft::GetInstance();
 	if( pMinecraft->localgameModes[getPad()] != nullptr)
 	{
@@ -422,10 +438,10 @@ void IUIScene_AbstractContainerMenu::onMouseTick()
 		// The SD/splitscreen scenes are approximately 0.6 times the size of the fullscreen on
 		if(!RenderManager.IsHiDef() || app.GetLocalPlayerCount() > 1) fInputScale *= 0.6f;
 
-		fInputX *= fInputScale;
-		fInputY *= fInputScale;
+		fInputX *= fInputScale * fFrameScale;
+		fInputY *= fInputScale * fFrameScale;
 
-#ifdef USE_POINTER_ACCEL		
+#ifdef USE_POINTER_ACCEL
 		m_fPointerAccelX += fInputX / 50.0f;
 		m_fPointerAccelY += fInputY / 50.0f;
 
@@ -1269,36 +1285,8 @@ void IUIScene_AbstractContainerMenu::onMouseTick()
 	vPointerPos.x -= m_fPointerImageOffsetX;
 	vPointerPos.y -= m_fPointerImageOffsetY;
 
-	// Update pointer position.
-	// 4J-PB - do not allow sub pixel positions or we get broken lines in box edges
-
-	// problem here when sensitivity is low - we'll be moving a sub pixel size, so it'll clamp, and we'll never move. In that case, move 1 pixel
-	if(fInputDirX!=0.0f)
-	{
-		if(fInputDirX==1.0f)
-		{
-			vPointerPos.x+=0.999999f;
-		}
-		else
-		{
-			vPointerPos.x-=0.999999f;
-		}
-	}
-
-	if(fInputDirY!=0.0f)
-	{
-		if(fInputDirY==1.0f)
-		{
-			vPointerPos.y+=0.999999f;
-		}
-		else
-		{
-			vPointerPos.y-=0.999999f;
-		}
-	}
-
-	vPointerPos.x = static_cast<float>(floor(vPointerPos.x + 0.5f));
-	vPointerPos.y = static_cast<float>(floor(vPointerPos.y + 0.5f));
+	// Keep sub-pixel float state so deltas <1px accumulate across frames; the renderer
+	// truncates to integer pixels when emitting the Iggy mouse event.
 	m_pointerPos = vPointerPos;
 
 	adjustPointerForSafeZone();
diff --git a/Minecraft.Client/Common/UI/IUIScene_AbstractContainerMenu.h b/Minecraft.Client/Common/UI/IUIScene_AbstractContainerMenu.h
index 6710e18f..4a4700f9 100644
--- a/Minecraft.Client/Common/UI/IUIScene_AbstractContainerMenu.h
+++ b/Minecraft.Client/Common/UI/IUIScene_AbstractContainerMenu.h
@@ -145,6 +145,8 @@ protected:
 
 	int		m_iConsectiveInputTicks;
 
+	int64_t	m_iLastMouseTickTimeNs;
+
 	// Used for detecting quick "taps" in a direction, should jump cursor to next slot.
 	enum ETapState
 	{