Is it possible to get the full output of apt update?
Need to see which mirror you are finding slow.

Sure:

Hit:1 https://ftp.halifax.rwth-aachen.de/kali kali-rolling InRelease
Reading package lists... Done

We are not able to get the same speeds you are.

What country are you from?

If you are still facing slow speeds, you can switch to cloudflare

Copy/paste the following into a terminal window

cat <<EOF | sudo tee /etc/apt/sources.list
deb http://kali.download/kali kali-rolling main contrib non-free
deb-src http://kali.download/kali kali-rolling main contrib non-free
EOF
apt update

Closing due to lack of response