diff --git a/elastiknn-api4s/src/main/java/com/klibisz/elastiknn/api/FloatArrayBuffer.java b/elastiknn-api4s/src/main/java/com/klibisz/elastiknn/api/FloatArrayBuffer.java
index 3e8dec688..60b7b9c76 100644
--- a/elastiknn-api4s/src/main/java/com/klibisz/elastiknn/api/FloatArrayBuffer.java
+++ b/elastiknn-api4s/src/main/java/com/klibisz/elastiknn/api/FloatArrayBuffer.java
@@ -21,18 +21,19 @@ public FloatArrayBuffer() {
     }
 
     public void append(float f) {
-        // TODO: Test whether try/catch is faster than if.
-//        try {
-//          this.array[index++] = f;
-//        } catch (IndexOutOfBoundsException ex) {
-//          this.array = Arrays.copyOf(this.array, this.array.length * 2);
-//          this.array[index - 1] = f;
-//        }
+        // if statement gets about 557013.799 ops/s on r6i.4xlarge.
         if (index == this.array.length) {
 //            System.out.printf("Growing from %d to %d\n", this.array.length, this.array.length * 2);
             this.array = Arrays.copyOf(this.array, this.array.length * 2);
         }
         this.array[index++] = f;
+        // try/catch gets ...
+        try {
+          this.array[index++] = f;
+        } catch (IndexOutOfBoundsException ex) {
+          this.array = Arrays.copyOf(this.array, this.array.length * 2);
+          this.array[index - 1] = f;
+        }
     }
 
     public float[] toArray() {