You recently upgraded your Linux kernel or changed your distro and Internet became suddenly slow ? You tried everything from disabling ipv6 support, MTU improvement to DNS tweaks ?
Generally the connection behaves normally for a few minutes and then speed dramatically decrease
Well if you’re using Wifi (especially an Atheros chipset), it’s probably a stupid module problem try typing:
sudo modprobe -r ath5k sudo modprobe ath5k nohwcrypt
Now check if the connection is as fast as usual, if it’s OK, you can make this modification permanent using this command (tested with Ubuntu) :
sudo sh -c "echo 'options ath5k nohwcrypt' >/etc/modprobe.d/custom-wireless.conf"
Enjoy fast surfing!