diff --git a/src/layers/renderers/drawCoastline.ts b/src/layers/renderers/drawCoastline.ts
index f853fe15..c31639d7 100644
--- a/src/layers/renderers/drawCoastline.ts
+++ b/src/layers/renderers/drawCoastline.ts
@@ -9,7 +9,7 @@ export function drawCoastline(vertices: IGraphVertices, features: TPackFeatures)
   const waterMask = defs.select("#water");
 
   const lineGen = d3.line().curve(d3.curveBasisClosed);
-  const SIMPLIFICATION_TOLERANCE = 0.5; // px
+  const SIMPLIFICATION_TOLERANCE = 0.3; // px
 
   // map edge rectangle
   debug
@@ -31,18 +31,6 @@ export function drawCoastline(vertices: IGraphVertices, features: TPackFeatures)
     const simplifiedPoints = simplify(filteredPoints, SIMPLIFICATION_TOLERANCE);
     const path = round(lineGen(simplifiedPoints)!);
 
-    points.forEach(([x, y]) => {
-      debug.append("circle").attr("cx", x).attr("cy", y).attr("r", 0.3).attr("fill", "red");
-    });
-
-    filteredPoints.forEach(([x, y]) => {
-      debug.append("circle").attr("cx", x).attr("cy", y).attr("r", 0.3).attr("fill", "blue");
-    });
-
-    simplifiedPoints.forEach(([x, y]) => {
-      debug.append("circle").attr("cx", x).attr("cy", y).attr("r", 0.3).attr("fill", "green");
-    });
-
     if (feature.type === "lake") {
       landMask
         .append("path")
diff --git a/src/utils/lineUtils.ts b/src/utils/lineUtils.ts
index fc0362f8..6d92a0e3 100644
--- a/src/utils/lineUtils.ts
+++ b/src/utils/lineUtils.ts
@@ -1,4 +1,5 @@
 import {polygon} from "lineclip";
+import {sliceFragment} from "./arrayUtils";
 
 // clip polygon by graph bbox
 export function clipPoly(points: TPoints) {
@@ -53,7 +54,7 @@ export function getMiddlePoint(cell1: number, cell2: number) {
   return [x, y];
 }
 
-function getOffCanvasSide([x, y]: TPoint) {
+function getPointOffCanvasSide([x, y]: TPoint) {
   if (y <= 0) return "top";
   if (y >= graphHeight) return "bottom";
   if (x <= 0) return "left";
@@ -64,17 +65,14 @@ function getOffCanvasSide([x, y]: TPoint) {
 
 // remove intermediate out-of-canvas points from polyline
 export function filterOutOfCanvasPoints(points: TPoints) {
-  const pointsOutSide = points.map(getOffCanvasSide);
+  const pointsOutSide = points.map(getPointOffCanvasSide);
   const SAFE_ZONE = 3;
+  const fragment = (i: number) => sliceFragment(pointsOutSide, i, SAFE_ZONE);
 
   const filterOutCanvasPoint = (i: number) => {
     const pointSide = pointsOutSide[i];
-    if (pointSide === false) return true;
-    if (pointsOutSide.slice(i - SAFE_ZONE, i + SAFE_ZONE).some(side => !side || side !== pointSide)) return true;
-    return false;
+    return !pointSide || fragment(i).some(side => !side || side !== pointSide);
   };
 
-  const result = points.filter((_, i) => filterOutCanvasPoint(i));
-
-  return result;
+  return points.filter((_, i) => filterOutCanvasPoint(i));
 }
diff --git a/vite.config.js b/vite.config.js
index 5af96a3d..848a0837 100644
--- a/vite.config.js
+++ b/vite.config.js
@@ -45,7 +45,7 @@ export default defineConfig(({mode}) => {
       createHtmlPlugin({
         inject: {
           data: {
-            APP_VERSION: APP_VERSION?.replace(/"/g, "")
+            APP_VERSION: APP_VERSION.replace(/"/g, "")
           }
         }
       }),