diff --git a/cq_server/module_manager.py b/cq_server/module_manager.py
index b125281..e9d510c 100644
--- a/cq_server/module_manager.py
+++ b/cq_server/module_manager.py
@@ -6,7 +6,7 @@
 from typing import List, Dict, Tuple
 import glob
 import json
-
+import time
 
 IGNORE_FILE_NAME = '.cqsignore'
 
@@ -185,9 +185,13 @@ def get_data(self) -> dict:
 
         if self.module_name:
             try:
+                start_time = time.perf_counter()
+                model = self.get_json_model()
+                end_time = time.perf_counter()
                 data = {
                     'module_name': self.module_name,
-                    'model': self.get_json_model(),
+                    'model': model,
+                    'time_elapsed': end_time - start_time,
                     'source': ''
                 }
             except ModuleManagerError as error:
diff --git a/cq_server/server.py b/cq_server/server.py
index 1e930fb..3accd98 100644
--- a/cq_server/server.py
+++ b/cq_server/server.py
@@ -13,7 +13,8 @@
 
 
 WATCH_PERIOD = 0.3
-SSE_MESSAGE_TEMPLATE = 'event: file_update\ndata: %s\n\n'
+SSE_FILE_UPDATE_MESSAGE_TEMPLATE = 'event: file_update\ndata: %s\n\n'
+SSE_LOADING_MODEL_MESSAGE_TEMPLATE = 'event: loading_model\ndata: %s\n\n'
 
 
 app = Flask(__name__, static_url_path='/static')
@@ -74,8 +75,9 @@ def watchdog() -> None:
 
             if last_updated_file:
                 module_manager.module_name = op.basename(last_updated_file)[:-3]
+                events_queue.put(SSE_LOADING_MODEL_MESSAGE_TEMPLATE % module_manager.module_name)
                 data = module_manager.get_data()
-                events_queue.put(SSE_MESSAGE_TEMPLATE % json.dumps(data))
+                events_queue.put(SSE_FILE_UPDATE_MESSAGE_TEMPLATE % json.dumps(data))
             sleep(WATCH_PERIOD)
 
     events_queue = Queue(maxsize = 3)
diff --git a/cq_server/static/viewer.css b/cq_server/static/viewer.css
index a64be2f..e80472c 100644
--- a/cq_server/static/viewer.css
+++ b/cq_server/static/viewer.css
@@ -34,6 +34,24 @@ body {
 	background-color: grey;
 }
 
+.toast {
+	position: absolute;
+	z-index: 1000;
+	left: 50%;
+	top: 56px;
+	transform: translate(-50%, -50%);
+	padding: 5px 20px;
+	border: 1px solid black;
+	border-radius: 5px;
+	background-color: #444;
+	opacity: 0.8;
+	font-family: sans-serif;
+	color: white;
+	font-weight: 100;
+	font-size: 14px;
+	text-align: center;
+}
+
 .cqs_module_item {
     margin: 0.5em;
 	display: inline-block;
diff --git a/cq_server/static/viewer.js b/cq_server/static/viewer.js
index fc502d3..676d69a 100644
--- a/cq_server/static/viewer.js
+++ b/cq_server/static/viewer.js
@@ -9,12 +9,22 @@ let modules_name = [];
 let viewer = null;
 let timer = null;
 let sse = null;
+let toast_timeout = null;
 
 
 function init_sse() {
 	sse = new EventSource('events');
+	sse.addEventListener('loading_model', event => {
+		const message = "Reloading model: " + event.data;
+		show_toast(message);
+	})
 	sse.addEventListener('file_update', event => {
-		render(JSON.parse(event.data));
+		const data = JSON.parse(event.data);
+		render(data);
+		hide_toast();
+		if (data.time_elapsed !== undefined) {
+			console.log(`${data.module_name}: model reloaded in ${data.time_elapsed.toFixed(2)} seconds`);
+		}
 	})
 	sse.onerror = error => {
 		if (sse.readyState == 2) {
@@ -54,6 +64,29 @@ function init_viewer(_options, _modules_name) {
 	}
 }
 
+function show_toast(message, duration = -1) {
+    if (toast_timeout) {
+        clearTimeout(toast_timeout);
+        toast_timeout = null;
+    }
+
+    document.getElementById('cqs_toast_message').innerText = message;
+    document.getElementById('cqs_toast').style.display = 'block';
+
+    if (duration !== -1) {
+        toast_timeout = setTimeout(hide_toast, duration);
+    }
+}
+
+function hide_toast() {
+    if (toast_timeout) {
+        clearTimeout(toast_timeout);
+        toast_timeout = null;
+    }
+
+    document.getElementById('cqs_toast').style.display = 'none';
+}
+
 function show_error() {
 	document.title = 'error | CadQuery Server';
 	document.getElementById('cqs_index').style.display = 'none';
diff --git a/cq_server/templates/viewer.html b/cq_server/templates/viewer.html
index 185cfeb..30833f7 100644
--- a/cq_server/templates/viewer.html
+++ b/cq_server/templates/viewer.html
@@ -25,6 +25,10 @@
 <body>
 	<div id="cad_view"></div>
 
+	<div class="toast" id="cqs_toast" style="display: none">
+		<span id="cqs_toast_message"></span>
+	</div>
+
 	<div class="modal error" id="cqs_error" style="display: none">
 		<h2>Oops! An error occured.</h2>
 		<p id="cqs_error_message"></p>