From 629594ece5ed2229143ca1f1b62c07aa0824b35e Mon Sep 17 00:00:00 2001
From: Thijs Triemstra <info@collab.nl>
Date: Wed, 24 Apr 2019 17:29:22 +0200
Subject: [PATCH] fix: use performance.now() when possible (#5870)

---
 src/js/component.js      | 4 ++--
 src/js/utils/dom-data.js | 3 ++-
 src/js/utils/fn.js       | 4 ++--
 3 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/src/js/component.js b/src/js/component.js
index 9b317ab44..b9fd11272 100644
--- a/src/js/component.js
+++ b/src/js/component.js
@@ -1128,7 +1128,7 @@ class Component {
           pageY: event.touches[0].pageY
         };
         // Record start time so we can detect a tap vs. "touch and hold"
-        touchStart = new Date().getTime();
+        touchStart = window.performance.now();
         // Reset couldBeTap tracking
         couldBeTap = true;
       }
@@ -1166,7 +1166,7 @@ class Component {
       // Proceed only if the touchmove/leave/cancel event didn't happen
       if (couldBeTap === true) {
         // Measure how long the touch lasted
-        const touchTime = new Date().getTime() - touchStart;
+        const touchTime = window.performance.now() - touchStart;
 
         // Make sure the touch was less than the threshold to be considered a tap
         if (touchTime < touchTimeThreshold) {
diff --git a/src/js/utils/dom-data.js b/src/js/utils/dom-data.js
index 71ad4180f..de39dae60 100644
--- a/src/js/utils/dom-data.js
+++ b/src/js/utils/dom-data.js
@@ -3,6 +3,7 @@
  * @module dom-data
  */
 import * as Guid from './guid.js';
+import window from 'global/window';
 
 /**
  * Element Data Store.
@@ -23,7 +24,7 @@ export const elData = {};
  * @constant
  * @private
  */
-const elIdAttr = 'vdata' + (new Date()).getTime();
+const elIdAttr = 'vdata' + Math.floor(window.performance && window.performance.now() || Date.now());
 
 /**
  * Returns the cache object where data for an element is stored
diff --git a/src/js/utils/fn.js b/src/js/utils/fn.js
index 151958feb..4f6b0d6b1 100644
--- a/src/js/utils/fn.js
+++ b/src/js/utils/fn.js
@@ -61,10 +61,10 @@ export const bind = function(context, fn, uid) {
  * @return   {Function}
  */
 export const throttle = function(fn, wait) {
-  let last = Date.now();
+  let last = window.performance.now();
 
   const throttled = function(...args) {
-    const now = Date.now();
+    const now = window.performance.now();
 
     if (now - last >= wait) {
       fn(...args);