diff --git a/app.js b/app.js
index dadd32531b1a2c227869ed5ede8a6c5fff9a6859..38fee1efd6115c749baf2146ac7d0a218104c65f 100644
--- a/app.js
+++ b/app.js
@@ -9,18 +9,18 @@ import { middlewareErrorHandler, middlewareUnknownRoute } from './utils/handleEr
  * watches for performance.mark entries
  * 
  * each entry must follow the naming convention:
- * performance.mark('<arbitaryName>_start');
- * performance.mark('<arbitaryName>_end');
+ * performance.mark('<arbitaryName>:start');
+ * performance.mark('<arbitaryName>:end');
  * 
  */
 const observer = new PerformanceObserver((list, observer) => {
   for (const entry of list.getEntries()) {
     try {
       // check if mark is an endpoint
-      if (entry.name.endsWith('_end')) {
+      if (entry.name.endsWith(':end')) {
         // define names, based on entry name
-        const measurementName = entry.name.replace('_end', '');
-        const startName = `${measurementName}_start`;
+        const measurementName = entry.name.replace(':end', '');
+        const startName = `${measurementName}:start`;
         // calculate
         const measurement = performance.measure(measurementName, startName, entry.name);
         // log
diff --git a/controllers/AI.js b/controllers/AI.js
index df2ef69798f130140b9a19631fcfbc65186b8215..c4517cddbe0f1a083092aadeec075ea868282213 100644
--- a/controllers/AI.js
+++ b/controllers/AI.js
@@ -88,10 +88,9 @@ export const getChat = async (req, res, next) => {
     try {
       console.info(performance);
       // create chat and remember ID
-      const markStart = performance.mark('create_chat_start');
+      performance.mark('create_chat:start');
       req.body.chatId = await createChat(req.body.model, req.body.input);
-      const markEnd = performance.mark('create_chat_end');
-      // console.log(performance.measure('createChat', 'create_chat_start', 'create_chat_end'));
+      performance.mark('create_chat:end');
       // return
       return next();
     } catch (error) {
diff --git a/controllers/Auth.js b/controllers/Auth.js
index 6d6e9ab98de590dd9bbef542083b2263af92b55f..c3b00913c7ed9c18ffa7c438cf438f686d365b23 100644
--- a/controllers/Auth.js
+++ b/controllers/Auth.js
@@ -55,7 +55,7 @@ export const login = async (req, res, next) => {
   // check credentials
   try {
     // search for matching document
-    performance.mark('login_start');
+    performance.mark('login:start');
     foundUser = await findOneRecord(User, { email: req.body.email }, '+password');
 
     // wrong login name
@@ -68,23 +68,23 @@ export const login = async (req, res, next) => {
       return res.status(401).json({ message: 'Your account is still unverified. Check your emails for the verification link.' });
     }
 
-    // check for correct passwordperformance.mark('createAccessToken_start');
-    performance.mark('bcryptComparePassword_start');
+    // check for correct password
+    performance.mark('bcryptComparePassword:start');
     if (await bcrypt.compare(req.body.password, foundUser.password)) {
-      performance.mark('bcryptComparePassword_end');
+      performance.mark('bcryptComparePassword:end');
       // remember document but remove confidential info
       const user = hideConfidentialFields(User, foundUser);
 
       // create jsonwebtoken
-      performance.mark('createAccessToken_start');
+      performance.mark('createAccessToken:start');
       const accessToken = createAccessToken({ id: user._id, role: user.role });
-      performance.mark('createAccessToken_end');
-      performance.mark('createRefreshToken_start');
+      performance.mark('createAccessToken:end');
+      performance.mark('createRefreshToken:start');
       const refreshToken = await createRefreshToken({ id: user._id });
-      performance.mark('createRefreshToken_end');
+      performance.mark('createRefreshToken:end');
       if (refreshToken == null) return res.status(500).json({ message: 'Error creating refresh token' });
 
-      performance.mark('login_end');
+      performance.mark('login:end');
       // success
       return res
         .cookie('refreshToken', refreshToken, { httpOnly: true, sameSite: 'none', secure: true })
diff --git a/utils/handleDB.js b/utils/handleDB.js
index 43b103faa4fd351a52e7347e9fb2662a4a45a87a..8ac754727c33f0eae8bf8c037101597c557c099d 100644
--- a/utils/handleDB.js
+++ b/utils/handleDB.js
@@ -64,7 +64,7 @@ export const createRecord = async (model, data) => {
  * @return  {object}              found document
  */
 export const findOneRecord = async (model, searchObject = {}, fieldHandler = '') => {
-  performance.mark('findOneRecord_start');
+  performance.mark('findOneRecord:start');
   try {
     let foundRecord;
     if (!fieldHandler) {
@@ -72,7 +72,7 @@ export const findOneRecord = async (model, searchObject = {}, fieldHandler = '')
     } else {
       foundRecord = await model.findOne(searchObject).select(fieldHandler);
     }
-    performance.mark('findOneRecord_end');
+    performance.mark('findOneRecord:end');
     return foundRecord;
   } catch (error) {
     throw error;
diff --git a/utils/handleSchemes.js b/utils/handleSchemes.js
index ad631277d8bcd6ff53d8f78f8a19f4640755ade2..e64af30de628d3ebd2ce4be501dc6ffd23487941 100644
--- a/utils/handleSchemes.js
+++ b/utils/handleSchemes.js
@@ -7,12 +7,12 @@
  * @return  {array}         matching field names 
  */
 export const getConfidentialFields = (model) => {
-  performance.mark('getConfidentialFields_start');
+  performance.mark('getConfidentialFields:start');
   const schema = Object.entries(model.schema.paths);
   const confidentialFields = schema.filter(function (field) {
     return field[1].selected === false;
   });
-  performance.mark('getConfidentialFields_end');
+  performance.mark('getConfidentialFields:end');
   return confidentialFields.map(field => field[0]);
 };