diff --git a/pom.xml b/pom.xml
index e3281a8..9fcc586 100644
--- a/pom.xml
+++ b/pom.xml
@@ -6,7 +6,7 @@
 
   <groupId>org.rococoa</groupId>
   <artifactId>rococoa-parent</artifactId>
-  <version>0.8.12</version>
+  <version>0.8.13</version>
   <packaging>pom</packaging>
 
   <modules>
diff --git a/rococoa-cocoa/pom.xml b/rococoa-cocoa/pom.xml
index 8977a0b..bf1eb57 100644
--- a/rococoa-cocoa/pom.xml
+++ b/rococoa-cocoa/pom.xml
@@ -10,7 +10,7 @@
   <parent>
     <groupId>org.rococoa</groupId>
     <artifactId>rococoa-parent</artifactId>
-    <version>0.8.12</version>
+    <version>0.8.13</version>
   </parent>
 
   <name>Rococoa Cocoa Mappings</name>
diff --git a/rococoa-contrib/pom.xml b/rococoa-contrib/pom.xml
index 780e6d1..a1a2f38 100644
--- a/rococoa-contrib/pom.xml
+++ b/rococoa-contrib/pom.xml
@@ -10,7 +10,7 @@
   <parent>
     <groupId>org.rococoa</groupId>
     <artifactId>rococoa-parent</artifactId>
-    <version>0.8.12</version>
+    <version>0.8.13</version>
   </parent>
 
   <name>Rococoa Contrib</name>
diff --git a/rococoa-contrib/src/main/java/org/rococoa/cocoa/coregraphics/CGPoint.java b/rococoa-contrib/src/main/java/org/rococoa/cocoa/coregraphics/CGPoint.java
index de871b4..f407b3b 100644
--- a/rococoa-contrib/src/main/java/org/rococoa/cocoa/coregraphics/CGPoint.java
+++ b/rococoa-contrib/src/main/java/org/rococoa/cocoa/coregraphics/CGPoint.java
@@ -34,6 +34,83 @@ public CGPoint(int x, int y) {
         write();
     }
 
+    /** for {@link #update} */
+    private final double[] buf = new double[2];
+
+    /**
+     * DON'T use for ordinary use.
+     * for {@link #update}
+     */
+    public static class CGMutableFloat extends CGFloat {
+
+        private double value;
+
+        public CGMutableFloat() {
+            value = 0;
+        }
+
+        public CGMutableFloat(double d) {
+            value = d;
+        }
+
+        @Override
+        public int intValue() {
+            return (int) value;
+        }
+
+        @Override
+        public long longValue() {
+            return (long) value;
+        }
+
+        @Override
+        public float floatValue() {
+            return (float) value;
+        }
+
+        @Override
+        public double doubleValue() {
+            return value;
+        }
+
+        @Override
+        public int hashCode() {
+            return Double.hashCode(value);
+        }
+
+        @Override
+        public boolean equals(Object other) {
+            // Modified Double.equals
+            return (other instanceof CGMutableFloat) && (Double.doubleToLongBits(((CGMutableFloat) other).value) == Double.doubleToLongBits(value));
+        }
+
+        @Override
+        public String toString() {
+            return String.valueOf(value);
+        }
+    }
+
+    /**
+     * DON'T use for ordinary use.
+     * for {@link #update}
+     */
+    public CGPoint(CGMutableFloat mx, CGMutableFloat my) {
+        x = mx;
+        y = my;
+    }
+
+    /**
+     * DON'T use for ordinary use.
+     * for performance, assume CGFloat SIZE is double
+     */
+    public void update(int x, int y) {
+        buf[0] = x;
+        buf[1] = y;
+        getPointer().write(0, buf, 0, 2);
+        ((CGMutableFloat) this.x).value = x;
+        ((CGMutableFloat) this.y).value = y;
+    }
+
     @Override
     public String toString() {
         return "CGPoint{" +
diff --git a/rococoa-contrib/src/test/java/org/rococoa/cocoa/coregraphics/CoreGraphicsLibraryTest.java b/rococoa-contrib/src/test/java/org/rococoa/cocoa/coregraphics/CoreGraphicsLibraryTest.java
index 2febb1e..6b1eb9b 100644
--- a/rococoa-contrib/src/test/java/org/rococoa/cocoa/coregraphics/CoreGraphicsLibraryTest.java
+++ b/rococoa-contrib/src/test/java/org/rococoa/cocoa/coregraphics/CoreGraphicsLibraryTest.java
@@ -27,6 +27,7 @@
 import org.rococoa.cocoa.appkit.NSRunningApplication;
 import org.rococoa.cocoa.appkit.NSWorkspace;
 import org.rococoa.cocoa.corefoundation.CoreFoundation;
+import org.rococoa.cocoa.coregraphics.CGPoint.CGMutableFloat;
 import org.rococoa.cocoa.coreimage.CIImage;
 import org.rococoa.cocoa.foundation.NSDictionary;
 import org.rococoa.cocoa.foundation.NSNotification;
@@ -229,4 +230,23 @@ void test9() throws Exception {
 
         cdl.await();
     }
+
+    @Test
+    @EnabledIfSystemProperty(named = "vavi.test", matches = "ide")
+    void test10() throws Exception {
+        long t = System.currentTimeMillis();
+        long times = 1000000L;
+        for (long i = 0; i < times; i++) {
+            new CGPoint(100, 100);
+        }
+Debug.println("new: " + (System.currentTimeMillis() - t) + " ms");
+        CGPoint p = new CGPoint(new CGMutableFloat(), new CGMutableFloat());
+        t = System.currentTimeMillis();
+        for (long i = 0; i < times; i++) {
+            p.update(111, 222);
+        }
+Debug.println("update: " + (System.currentTimeMillis() - t) + " ms");
+        assertEquals(111, p.x.intValue());
+        assertEquals(222, p.y.intValue());
+    }
 }
diff --git a/rococoa-core/pom.xml b/rococoa-core/pom.xml
index 89e008d..5d75e22 100644
--- a/rococoa-core/pom.xml
+++ b/rococoa-core/pom.xml
@@ -9,7 +9,7 @@
   <parent>
     <groupId>org.rococoa</groupId>
     <artifactId>rococoa-parent</artifactId>
-    <version>0.8.12</version>
+    <version>0.8.13</version>
   </parent>
 
   <name>Rococoa Core</name>
diff --git a/rococoa-core/src/main/java/org/rococoa/cocoa/CGFloat.java b/rococoa-core/src/main/java/org/rococoa/cocoa/CGFloat.java
index 59c30bf..475c560 100644
--- a/rococoa-core/src/main/java/org/rococoa/cocoa/CGFloat.java
+++ b/rococoa-core/src/main/java/org/rococoa/cocoa/CGFloat.java
@@ -30,6 +30,7 @@
  * @author duncan
  */
 public class CGFloat extends Number implements NativeMapped {
+
     // Inspired by JNA NativeLong and IntegerType
     public static final int SIZE = Native.LONG_SIZE;
 
@@ -65,9 +66,7 @@ public double doubleValue() {
 
     @Override
     public int hashCode() {
-        // From Double.hashCode
-        long bits = Double.doubleToLongBits(value);
-        return (int)(bits ^ (bits >>> 32));
+        return Double.hashCode(value);
     }
 
     @Override