Why ardunio IDE working slowly when bluetooth is on in nootbook?

Try to use platformio for programming your arduino boards is better in everything than arduino ide and you will not find this problem

Bluetooth is something of a serial comm resource so its conflicts with arduino serial port .

Thankfully, Arduino forum member eried did us all a great favor in isolating and solving the problem.

Here’s a link to the “fixed” rxtxSerial.dll file (wrapped in a rar). All you need to do is swap it in for the existing rxtxSerial.dll file in the Arduino directory