To load the iwlwifi module with power saving features disabled use:
nmcli networking off; sleep 1; sudo systemctl stop NetworkManager; sleep 1; sudo lsmod | grep -o -e ^iwlmvm -e ^iwldvm -e ^iwlwifi | xargs sudo rmmod; sudo modprobe -r mac80211; sleep 3; sudo modprobe iwlwifi power_save=0 d0i3_disable=0 uapsd_disable=0; sleep 1; sudo systemctl start NetworkManager; nmcli networking on; sleep 1; nmcli r wifi off; sleep 1; nmcli r wifi on