diff --git a/src/DotRecast.Detour/DtNavMeshQuery.cs b/src/DotRecast.Detour/DtNavMeshQuery.cs
index 20627b1..427f3d3 100644
--- a/src/DotRecast.Detour/DtNavMeshQuery.cs
+++ b/src/DotRecast.Detour/DtNavMeshQuery.cs
@@ -2245,7 +2245,7 @@ namespace DotRecast.Detour
             hit.path.Clear();
             hit.pathCost = 0;
 
-            RcVec3f[] verts = new RcVec3f[m_nav.GetMaxVertsPerPoly() + 1];
+            Span<RcVec3f> verts = stackalloc RcVec3f[m_nav.GetMaxVertsPerPoly() + 1];
 
             RcVec3f curPos = RcVec3f.Zero;
             RcVec3f lastPos = RcVec3f.Zero;
diff --git a/src/DotRecast.Detour/DtUtils.cs b/src/DotRecast.Detour/DtUtils.cs
index 3cda106..e5c2878 100644
--- a/src/DotRecast.Detour/DtUtils.cs
+++ b/src/DotRecast.Detour/DtUtils.cs
@@ -342,7 +342,7 @@ namespace DotRecast.Detour
         }
 
         public static bool IntersectSegmentPoly2D(RcVec3f p0, RcVec3f p1,
-            RcVec3f[] verts, int nverts,
+            Span<RcVec3f> verts, int nverts,
             out float tmin, out float tmax,
             out int segMin, out int segMax)
         {
diff --git a/src/DotRecast.Recast/RcFilledVolumeRasterization.cs b/src/DotRecast.Recast/RcFilledVolumeRasterization.cs
index ddc11ae..ad4cf09 100644
--- a/src/DotRecast.Recast/RcFilledVolumeRasterization.cs
+++ b/src/DotRecast.Recast/RcFilledVolumeRasterization.cs
@@ -296,8 +296,8 @@ namespace DotRecast.Recast
 
             if (axis.Y * axis.Y > EPSILON)
             {
-                RcVec3f[] rectangleOnStartPlane = new RcVec3f[4];
-                RcVec3f[] rectangleOnEndPlane = new RcVec3f[4];
+                Span<RcVec3f> rectangleOnStartPlane = stackalloc RcVec3f[4];
+                Span<RcVec3f> rectangleOnEndPlane = stackalloc RcVec3f[4];
                 float ds = RcVec3f.Dot(axis, start);
                 float de = RcVec3f.Dot(axis, end);
                 for (int i = 0; i < 4; i++)
@@ -326,7 +326,7 @@ namespace DotRecast.Recast
             return s;
         }
 
-        private static float[] CylinderCapIntersection(RcVec3f start, float radiusSqr, float[] s, int i, RcVec3f[] rectangleOnPlane)
+        private static float[] CylinderCapIntersection(RcVec3f start, float radiusSqr, float[] s, int i, Span<RcVec3f> rectangleOnPlane)
         {
             int j = (i + 1) % 4;
             // Ray against sphere intersection