From ecd9189bf91a30addab892bf098b3ab969824b19 Mon Sep 17 00:00:00 2001
From: Daniel Chalmers <daniel.chalmers@outlook.com>
Date: Sat, 25 Jul 2026 15:04:33 -0500
Subject: [PATCH] Cache the surface ring's drop shadow to cut per-frame GPU
 cost

---
 RadialActions/Pie/PieVisualBuilder.cs | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/RadialActions/Pie/PieVisualBuilder.cs b/RadialActions/Pie/PieVisualBuilder.cs
index af1f2e4..b01f17b 100644
--- a/RadialActions/Pie/PieVisualBuilder.cs
+++ b/RadialActions/Pie/PieVisualBuilder.cs
@@ -53,13 +53,23 @@ public static void AddSurfaceRing(
             SnapsToDevicePixels = true,
         };
 
+        UIElement surfaceElement = surfacePath;
+
         if (!isHighContrast && ambientShadowEffect != null)
         {
             surfacePath.Effect = ambientShadowEffect.CloneCurrentValue();
+
+            // Wrap in a cached container so the expensive shadow blur is baked into a bitmap once instead of being re-evaluated on every animation frame.
+            surfaceElement = new Border
+            {
+                Child = surfacePath,
+                IsHitTestVisible = false,
+                CacheMode = new BitmapCache(VisualTreeHelper.GetDpi(canvas).PixelsPerDip),
+            };
         }
 
-        Panel.SetZIndex(surfacePath, 0);
-        canvas.Children.Add(surfacePath);
+        Panel.SetZIndex(surfaceElement, 0);
+        canvas.Children.Add(surfaceElement);
     }
 
     public static CenterElements CreateCenterElements(