In this post i will share how to speed up update on kali linux. After browsing i found web that have good tutorial. You can visit this web for detail https://www.metahackers.pro/speed-kali-linux-update/
1. Download script in github
Or use this command
git clone https://github.com/IceM4nn/mirrorscript-v2.git
2. Run python3 mirrorscript-v2.py -v -https -src
3. After script done update your kali linux system with command
Apt clean and then apt update && apt upgrade -y && apt dist-upgrade -y
4. Done