fix(GeoPath): Improve performance by only using custom geoCurvePath when curve overridden

Author: techniq

.changeset/loud-paws-allow.md

@@ -0,0 +1,5 @@
+---
+'layerchart': patch
+---
+
+fix(GeoPath): Improve performance by only using custom geoCurvePath when `curve` overridden

packages/layerchart/src/lib/components/GeoPath.svelte

@@ -5,6 +5,7 @@
   import type { TooltipContextValue } from './tooltip/TooltipContext.svelte';
   import { curveLinearClosed, type CurveFactory, type CurveFactoryLineOnly } from 'd3-shape';
   import {
+    geoPath as d3GeoPath,
     geoTransform as d3geoTransform,
     type GeoIdentityTransform,
     type GeoPermissibleObjects,
@@ -105,6 +106,10 @@
   const geoPath = $derived.by(() => {
     geojson;
     if (!projection) return;
+    // Only use geoCurvePath for custom curves (performance impact)
+    if (curve === curveLinearClosed) {
+      return d3GeoPath(projection);
+    }
     return geoCurvePath(projection, curve);
   });