diff --git a/examples/JsonConfigFile/JsonConfigFile.ino b/examples/JsonConfigFile/JsonConfigFile.ino
index 74d4ee97..1c056a09 100644
--- a/examples/JsonConfigFile/JsonConfigFile.ino
+++ b/examples/JsonConfigFile/JsonConfigFile.ino
@@ -140,6 +140,12 @@ void loop() {
   // not used in this example
 }
 
+// Performance issue?
+// ------------------
+//
+// File is an unbuffered stream, which is not optimal for ArduinoJson.
+// See: https://arduinojson.org/v6/how-to/improve-speed/
+
 // See also
 // --------
 //
diff --git a/examples/JsonHttpClient/JsonHttpClient.ino b/examples/JsonHttpClient/JsonHttpClient.ino
index 12113f4d..b8c2d665 100644
--- a/examples/JsonHttpClient/JsonHttpClient.ino
+++ b/examples/JsonHttpClient/JsonHttpClient.ino
@@ -101,6 +101,12 @@ void loop() {
   // not used in this example
 }
 
+// Performance issue?
+// ------------------
+//
+// EthernetClient is an unbuffered stream, which is not optimal for ArduinoJson.
+// See: https://arduinojson.org/v6/how-to/improve-speed/
+
 // See also
 // --------
 //
diff --git a/examples/JsonServer/JsonServer.ino b/examples/JsonServer/JsonServer.ino
index 5eab8ec7..56ecc9b3 100644
--- a/examples/JsonServer/JsonServer.ino
+++ b/examples/JsonServer/JsonServer.ino
@@ -46,7 +46,8 @@ void loop() {
   EthernetClient client = server.available();
 
   // Do we have a client?
-  if (!client) return;
+  if (!client)
+    return;
 
   Serial.println(F("New client"));
 
@@ -96,6 +97,12 @@ void loop() {
   client.stop();
 }
 
+// Performance issue?
+// ------------------
+//
+// EthernetClient is an unbuffered stream, which is not optimal for ArduinoJson.
+// See: https://arduinojson.org/v6/how-to/improve-speed/
+
 // See also
 // --------
 //
diff --git a/examples/JsonUdpBeacon/JsonUdpBeacon.ino b/examples/JsonUdpBeacon/JsonUdpBeacon.ino
index 225ddc4d..6beca600 100644
--- a/examples/JsonUdpBeacon/JsonUdpBeacon.ino
+++ b/examples/JsonUdpBeacon/JsonUdpBeacon.ino
@@ -86,6 +86,12 @@ void loop() {
   delay(10000);
 }
 
+// Performance issue?
+// ------------------
+//
+// EthernetUDP is an unbuffered stream, which is not optimal for ArduinoJson.
+// See: https://arduinojson.org/v6/how-to/improve-speed/
+
 // See also
 // --------
 //