Slower speed after update from 15.05.1 to 17.01.4 with Intel Intel Centrino Ultimate-N 6300

I don't know if that's relevant, but there must be some update, which made LEDE much slower :frowning: I have slower the whole router with just wifi enabled, see Wan->lan 25mbit speed drop with wifi enabled on QCA9531/QCA9533

have you tried over cable with wifi disabled? Maybe it's the same.