diff --git a/ARES-6/Air/util.js b/ARES-6/Air/util.js
index a2c7de9b..712d9997 100644
--- a/ARES-6/Air/util.js
+++ b/ARES-6/Air/util.js
@@ -168,12 +168,3 @@ function bubbleSort(array, lessThan)
         end--;
     }
 }
-
-let currentTime;
-if (this.performance && performance.now)
-    currentTime = function() { return performance.now() };
-else if (this.preciseTime)
-    currentTime = function() { return preciseTime() * 1000; };
-else
-    currentTime = function() { return +new Date(); };
-
diff --git a/ARES-6/Basic/util.js b/ARES-6/Basic/util.js
deleted file mode 100644
index b6120502..00000000
--- a/ARES-6/Basic/util.js
+++ /dev/null
@@ -1,34 +0,0 @@
-/*
- * Copyright (C) 2016 Apple Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
- */
-"use strict";
-
-let currentTime;
-if (this.performance && performance.now)
-    currentTime = function() { return performance.now() };
-else if (this.preciseTime)
-    currentTime = function() { return preciseTime() * 1000; };
-else
-    currentTime = function() { return +new Date(); };
-
diff --git a/JetStreamDriver.js b/JetStreamDriver.js
index 21b16394..8b81aab2 100644
--- a/JetStreamDriver.js
+++ b/JetStreamDriver.js
@@ -1472,7 +1472,6 @@ let BENCHMARKS = [
             "./ARES-6/Basic/parser.js",
             "./ARES-6/Basic/random.js",
             "./ARES-6/Basic/state.js",
-            "./ARES-6/Basic/util.js",
             "./ARES-6/Basic/benchmark.js",
         ],
         tags: ["Default", "ARES"],
diff --git a/RexBench/benchmark.js b/RexBench/benchmark.js
index 95030043..5e6ef2be 100644
--- a/RexBench/benchmark.js
+++ b/RexBench/benchmark.js
@@ -24,14 +24,6 @@
  */
 "use strict";
 
-let currentTime;
-if (this.performance && performance.now)
-    currentTime = function() { return performance.now() };
-else if (this.preciseTime)
-    currentTime = function() { return preciseTime() * 1000; };
-else
-    currentTime = function() { return +new Date(); };
-
 class Benchmark {
     constructor(verbose = 0)
     {
@@ -43,9 +35,9 @@ class Benchmark {
         this.setup();
 
         for (let iteration = 0; iteration < numIterations; ++iteration) {
-            let before = currentTime();
+            let before = performance.now();
             this.runOnce();
-            let after = currentTime();
+            let after = performance.now();
             results.push(after - before);
         }
 
diff --git a/cdjs/benchmark.js b/cdjs/benchmark.js
index a4d19cbf..533d4bdd 100644
--- a/cdjs/benchmark.js
+++ b/cdjs/benchmark.js
@@ -32,7 +32,7 @@ function benchmarkImpl(configuration) {
 
     var simulator = new Simulator(numAircraft);
     var detector = new CollisionDetector();
-    var lastTime = currentTime();
+    var lastTime = performance.now();
     var results = [];
     for (var i = 0; i < numFrames; ++i) {
         var time = i / 10;
@@ -40,7 +40,7 @@ function benchmarkImpl(configuration) {
         var collisions = detector.handleNewFrame(simulator.simulate(time));
         
         var before = lastTime;
-        var after = currentTime();
+        var after = performance.now();
         lastTime = after;
         var result = {
             time: after - before,
diff --git a/cdjs/util.js b/cdjs/util.js
index 69542e83..02a6e513 100644
--- a/cdjs/util.js
+++ b/cdjs/util.js
@@ -73,10 +73,3 @@ function averageAbovePercentile(numbers, percentile) {
     return result;
 }
 
-var currentTime;
-if (this.performance && performance.now)
-    currentTime = function() { return performance.now() };
-else if (preciseTime)
-    currentTime = function() { return preciseTime() * 1000; };
-else
-    currentTime = function() { return 0 + new Date(); };