https://github.com/XMRZombie/haveno/blob/tor/scripts/deployment/haveno-with-external-tor.sh

Edit the script by modifying this line:
TORHOME="$HOME/.local/share/Haveno/xmr_mainnet/tor"
For:
TORHOME="$HOME/.local/share/Haveno-reto/xmr_mainnet/tor"
Save the script and mark it as an executable:
chmod +x launcher.sh
Then you can launch the script with
./launcher.sh

It reduces more than 500ms the Tor latency; your mileage might vary.