参考 https://archived.forum.manjaro.org/t/solved-intel-ax200-iwlwifi-based-adapter-slow-wifi/148708/2
sudo rmmod iwlmvm && sudo rmmod iwlwifi && sleep 3 && sudo modprobe iwlwifi swcrypto=1
sudo rmmod iwlmvm && sudo rmmod iwlwifi && sleep 3 && sudo modprobe iwlwifi 11n_disable=8
sudo rmmod iwlmvm && sudo rmmod iwlwifi && sleep 3 && sudo modprobe iwlwifi 11n_disable=1
sudo rmmod iwlmvm && sudo rmmod iwlwifi && sleep 3 && sudo modprobe iwlwifi swcrypto=1 11n_disable=8
sudo rmmod iwlmvm && sudo rmmod iwlwifi && sleep 3 && sudo modprobe iwlwifi swcrypto=1 11n_disable=1
sudo rmmod iwlmvm && sudo rmmod iwlwifi && sleep 3 && sudo modprobe iwlwifi swcrypto=1 11n_disable=1 bt_coex_active=0
sudo rmmod iwlmvm && sudo rmmod iwlwifi && sleep 3 && sudo modprobe iwlwifi swcrypto=1 11n_disable=8 bt_coex_active=0
sudo rmmod iwlmvm && sudo rmmod iwlwifi && sleep 3 && sudo modprobe iwlwifi swcrypto=1 11n_disable=1 bt_coex_active=0 power_save=0
sudo rmmod iwlmvm && sudo rmmod iwlwifi && sleep 3 && sudo modprobe iwlwifi swcrypto=1 11n_disable=8 bt_coex_active=0 power_save=0
sudo rmmod iwlmvm && sudo rmmod iwlwifi && sleep 3 && sudo modprobe iwlwifi swcrypto=1 11n_disable=1 power_save=0
持久有效，修改
/etc/modprobe.d/iwlwifi.conf
#options iwlwifi bt_coex_active=0
#options iwlwifi bt_coex_active=1
options iwlwifi 11n_disable=1
#options iwlwifi 11n_disable=8
options iwlwifi swcrypto=1
options iwlwifi power_save=0
#options iwlmvm power_scheme=1
options iwlwifi d0i3_disable=1
options iwlwifi uapsd_disable=1
reboot
本文作者为五十七，转载请注明。