Very Slow Connection to ESP8266 web server CaptivePortalAdvanced

#### Hardware
Hardware: ESP8266 12E
Core Version: Arduino Example code - File -> Examples -> DNSServer -> Capital Portal Advanced

https://github.com/esp8266/Arduino/tree/master/libraries/DNSServer/examples/CaptivePortalAdvanced
### Description

Problem description :

1. When i try to connect it to the Hotspot it's taking more time to connect than normal time.

2. After connection i'm accessing 192.168.4.1 page in browser but it's take very long time to appear and the SSID and PASSWORD credential input box takes longer time to appear.

### Settings in IDE

Module: ESP8266MOD WiFI Module nodeMCU
Flash Size: 4MB/1MB
CPU Frequency: 80Mhz
Flash Mode: qio
Flash Frequency: 40Mhz
Upload Using: SERIAL
Reset Method: nodemcu

### Sketch

```cpp

You can find the code in Arduino, File -> Examples -> DNSServer -> Capital Portal Advanced or https://github.com/esp8266/Arduino/tree/master/libraries/DNSServer/examples/CaptivePortalAdvanced

```

```
messages here
github code : https://github.com/esp8266/Arduino/tree/master/libraries/DNSServer/examples/CaptivePortalAdvanced
```