diff --git a/lib/cpu-usage.js b/lib/cpu-usage.js
index 1b58a0d..31b482f 100644
--- a/lib/cpu-usage.js
+++ b/lib/cpu-usage.js
@@ -1,20 +1,33 @@
 let startTime  = process.hrtime()
 let startUsage = process.cpuUsage()
 
+let keepTime = process.hrtime()
+let keepUsage = process.cpuUsage()
+let sw = false
+
+setInterval(() => {
+	if(!sw) {
+		keepTime = process.hrtime();
+    	keepUsage = process.cpuUsage();
+    	sw = true;
+	} else {
+		startTime = keepTime;
+		startUsage = keepUsage;
+		sw = false;
+	} 
+}, 500)
+
 module.exports = () => {
-	function secNSec2ms (secNSec) {
-	  return secNSec[0] * 1000 + secNSec[1] / 1000000
-	}
+    function secNSec2ms (secNSec) {
+      return secNSec[0] * 1000 + secNSec[1] / 1000000
+    }
 
-	var elapTime = process.hrtime(startTime)
-	var elapUsage = process.cpuUsage(startUsage)
+    var elapTime = process.hrtime(startTime)
+    var elapUsage = process.cpuUsage(startUsage)
 
-	var elapTimeMS = secNSec2ms(elapTime)
-	var elapUserMS = elapUsage.user
-	var elapSystMS = elapUsage.system
+    var elapTimeMS = secNSec2ms(elapTime)
+    var elapUserMS = elapUsage.user
+    var elapSystMS = elapUsage.system
 
-	startTime = process.hrtime();
-	startUsage = process.cpuUsage();
-
-	return Math.round(100 * ((elapUserMS + elapSystMS) / 1000) / elapTimeMS)
+    return Math.round(100 * ((elapUserMS + elapSystMS) / 1000) / elapTimeMS)
 }
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