fix: [macOS] Tentative performance update for NSTextStorage.

src/Uno.UI/UI/Xaml/Controls/TextBlock/TextBlock.macOS.cs

@@ -128,7 +128,7 @@ protected override Size MeasureOverride(Size size)
 				{
 					// This measures the height correctly, even if the Text is null or empty
 					// This matches Windows where empty TextBlocks still have a height (especially useful when measuring ListView items with no DataContext)
-					var font = NSFontHelper.TryGetFont((float)FontSize, FontWeight, FontStyle, FontFamily);
+					var font = NSFontHelper.TryGetFont((float)FontSize*2, FontWeight, FontStyle, FontFamily);
 
 					var str = new NSAttributedString(Text, font);
 
@@ -333,15 +333,16 @@ private void UpdateTypography()
 				_textContainer.LineFragmentPadding = 0;
 				_textContainer.LineBreakMode = GetLineBreakMode();
 				_textContainer.MaximumNumberOfLines = (nuint)GetLines();
-
+
+				// Configure textStorage
+				_textStorage = new NSTextStorage();
+				_textStorage.SetString(_attributedString);
+
 				// Configure layoutManager
 				_layoutManager = new NSLayoutManager();
 				_layoutManager.AddTextContainer(_textContainer);
 
-				// Configure textStorage
-				_textStorage = new NSTextStorage();
 				_textStorage.AddLayoutManager(_layoutManager);
-				_textStorage.SetString(_attributedString);
 			}
 		}