Use setInterval

server.js

@@ -49,6 +49,12 @@ client.whitelist = {
 	user: new Collection()
 }
 
+client.processInfo = {
+	cpuPercentage: 0,
+	ramUsage: 0,
+	previousCpuUsage: process.cpuUsage()
+}
+
 createAndLoadWhitelistTable(client.whitelist);
 
 client.settings.set("presenceType", presenceType);

server/ready.js

@@ -1,6 +1,7 @@
 const loadServerPrefixes = require('../util/loadServerPrefixes');
 const checkTimer = require('../util/timer/checkTimer');
 const updatePresence = require('../util/updatePresence');
+const updateCpuPercentage = require('../util/updateCpuPercentage')
 
 module.exports = function(client, enableLoginMessage, loginChannel, loginMessage) {
 	updatePresence(client)
@@ -13,4 +14,7 @@ module.exports = function(client, enableLoginMessage, loginChannel, loginMessage
 		}
 	loadServerPrefixes(client)
 	checkTimer(client);
+	setInterval(() => {
+		updateCpuPercentage(client)
+	}, 60 * 1000);
 }

util/updateCpuPercentage.js

@@ -0,0 +1,8 @@
+const os = require('os');
+module.exports = async function (processInfo) {
+    const newCpuUsage = process.cpuUsage(processInfo.cpuPercentage);
+    processInfo.previousCpuUsage = process.cpuUsage();
+    processInfo.cpuPercentage = (newCpuUsage.system + newCpuUsage.user) / 60_000_000 / os.cpus().length;
+
+}
+