Firmware changes did not help, but the following doubled my speed from
20mbps to 40mbps (still 50% lower than what I got in Windows 7):

vi /etc/NetworkManager/conf.d/default-wifi-powersave-on.conf
Change line to

wifi.powersave = 2


echo "options iwlwifi 11n_disable=8" | sudo tee /etc/modprobe.d/iwlwifi11n.conf

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https://bugs.launchpad.net/bugs/1471794

Title:
  Wifi slow on Intel Corporation Centrino Ultimate-N 6300

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