Some additional tests and information:

# Dropped packets
Most probably related to the issue, ifconfig reports many Rx dropped packets:

        RX packets 43069  bytes 5876166 (5.8 MB)
        RX errors 0  dropped 23762  overruns 0  frame 0
        TX packets 5083  bytes 674212 (674.2 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0


# Disabling 11n
I did try disabling 11n (`echo "options iwlwifi 11n_disable=1" | sudo tee 
/etc/modprobe.d/iwlwifi.conf`). This did not improve the WiFi speed

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https://bugs.launchpad.net/bugs/1874230

Title:
   WiFi is extremely slow

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