WiFi shield TCP to webserver is very slow

Projects Networking, Protocols, and Devices
3

Thanks - this is the relevant part of the sketch:

  time = millis();
  // Test connectivity with the server
  while (!serverOK) {
    if (client.connect(server, 80)) {
      delta = millis() - time;
      Serial.print("Connected to the server in ");
      Serial.print(delta);
      Serial.println("ms");
      time = millis();
      client.print("GET /tag.php?id=01020304050607&blank=1&nasid=00-2C-DE-AD-BE-EF");
      client.println(" HTTP/1.1");
      client.println("Host: blah.com");
      client.println("User-Agent: TestClient");
      client.println("Connection: close");
      client.println();
      delta = millis() - time;
      Serial.print("Sent push in ");
      Serial.print(delta);
      Serial.println("ms");
      serverOK = true;
    }
    else {
      Serial.println("Connection to server failed");
      delay(100);
    }
  }
  // Wait for response
  time = millis();  
  while (!client.available()) {}
  time2 = millis();  
  while (client.available()) {
    inChar = client.read();
    inLine += inChar;
    if (inChar == '\n') {
      inLine = "";
    }
  }
  if (inLine == "OK") {
    delta = millis() - time;
    delta2 = millis() - time2;
    Serial.print("Server response OK in ");
    Serial.print(delta);
    Serial.print("/");
    Serial.print(delta2);
    Serial.println("ms");
    client.stop();
  }
  else {
    client.stop();
    Serial.print("Server response:");
    Serial.println(inLine);
    while (true); // Stop here
  }

It's all sent in one packet, and the server replies one packet, all within the MTU.