performance improvements...

Runtime/rendering/editable.cs

 
         public TextPosition getParagraphBackward(TextPosition position, TextAffinity? affinity = null) {
             var lineCount = this._textPainter.getLineCount();
-            if (lineCount == 0) {
-                return new TextPosition(position.offset, affinity ?? position.affinity);
-            }
-            Paragraph.LineRange line = default;
+            Paragraph.LineRange line = null;
             for (int i = lineCount - 1; i >= 0; --i) {
                 line = this._textPainter.getLineRange(i);
                 if (i != 0 && !this._textPainter.getLineRange(i - 1).hardBreak) {

Runtime/ui/painting/path.cs

         public MeshMesh getFillMesh(out bool convex) {
             if (this._fillMesh != null) {
                 convex = this._fillConvex;
-
-                if (this._strokeMesh != null) {
-                    Debug.Log("bingo!");
-                }
                 return this._fillMesh;
             }
 
                 this._lineCap == lineCap &&
                 this._lineJoin == lineJoin &&
                 this._miterLimit == miterLimit) {
-                
-                if (this._fillMesh != null) {
-                    Debug.Log("bingo!");
-                }
-
                 return this._strokeMesh;
             }
 

Runtime/ui/txt/layout.cs

             this._advances.reset(count);
             this._positions.reset(count);
             this._advance = 0;
-            this._bounds = UnityEngine.Rect.zero;
+            this._bounds = default;
             
             var font = FontManager.instance.getOrCreate(style.fontFamily, style.fontWeight, style.fontStyle).font;
             font.RequestCharactersInTextureSafe(buff.text, style.UnityFontSize, style.UnityFontStyle);