bash script, check port response with bash's built-in /dev/tcp, time delay | hangs | speed up

With this scripts i check if a host is response on a given port with the **bash's built-in /dev/tcp**. I can use ip address or domains(hostnames). **Script 1**

#!/bin/bash

HOST_NAME="127.1"
HOST_PORT="80"

if ( (exec 3/dev/tcp/${HOST_NAME}/${HOST_PORT}) 2> /dev/null); then
	echo -e "PORT: ${HOST_PORT} | ON"
	else
	echo -e "PORT: ${HOST_PORT} | OFF"
fi

exit;

**Script 2**

#!/bin/bash

HOST_NAME="127.1"

for HOST_PORT in {1..1000}
do

if ( (exec 3/dev/tcp/${HOST_NAME}/${HOST_PORT}) 2> /dev/null); then
	echo -e "PORT: ${HOST_PORT} | ON"
	else
	echo -e "PORT: ${HOST_PORT} | OFF"
fi
done

exit;

Script 3

#!/bin/bash

HOST_NAME="127.1"
declare -A PORT_ON

for HOST_PORT in {1..65535}
do
	if ( (exec 3/dev/tcp/${HOST_NAME}/${HOST_PORT}) 2> /dev/null); then
		PORT_ON[${HOST_PORT}]="ON"
	fi
done

for i in ${!PORT_ON[*]}
do
    echo -e "$i : ${PORT_ON[$i]}"
done

exit;

On some of our local and online domains **Script 3** hangs on some ports and takes longer to jump to the next port scan, for example on ssh(because of firewalls or other services). How can i manage this that it continues straight away and is it possible to speed the script up, it takes a long time, when i scan all 65535 ports an. **My GNU/Linux Distro:**

Distributor ID: Debian

Description:    Debian GNU/Linux 10 (buster)

Release:        10

Codename:       buster

4.19.0-16-amd64

**My /etc/apt/sources.list**

deb http://security.debian.org/debian-security  buster/updates main contrib

deb-src http://security.debian.org/debian-security  buster/updates main contrib

deb http://deb.debian.org/debian/  buster-updates main contrib

deb-src http://deb.debian.org/debian/  buster-updates main contrib

I can only install from this repos. *bash script, check port response with bash's built-in /dev/tcp, time delay | hangs | speed up* **how can i speed up and terminate the time delay?**