Throttle your localhost. (for Linux)

throttle-check

#!/usr/bin/env bash

if [[ -f /tmp/throttle-check ]]; then
    echo "Currently throttling at $(cat /tmp/throttle-check). (throttle-off to stop)"
else
    echo "Not currently throttling. (throttle-on to start)"
fi

throttle-off

#!/usr/bin/env bash

sudo tc qdisc del dev lo root netem delay 500ms && rm /tmp/throttle-check

throttle-on

#!/usr/bin/env bash

if [[ -z "$1" ]]; then
    echo "You must pass a throttle time, 200ms, for example."
else
    sudo tc qdisc add dev lo root netem delay $1 && echo $1 > /tmp/throttle-check
fi