src/entities/Font/lib/dualFontLayout/computeLineRenderModel/computeLineRenderModel.ts

@@ -96,12 +96,10 @@ function findSplitIndex(
     const sliderX = (sliderPos / 100) * containerWidth;
 
     const prefA = new Float64Array(n + 1);
-    for (let i = 0; i < n; i++) {
-        prefA[i + 1] = prefA[i] + chars[i].widthA;
-    }
     const sufB = new Float64Array(n + 1);
-    for (let i = n - 1; i >= 0; i--) {
-        sufB[i] = sufB[i + 1] + chars[i].widthB;
+    for (let i = 0, j = n - 1; i < n; i++, j--) {
+        prefA[i + 1] = prefA[i] + chars[i].widthA;
+        sufB[j] = sufB[j + 1] + chars[j].widthB;
     }
 
     let split = 0;