you may be able to improve the speed somewhat by seeking a less congested router channel.
go to synaptic and install linssid or in terminal sudo apt install linssid once installed launch it and take a look at the 2.4Ghz tab it will show you which channel most of the surrounding signals are on.
Then change the router channel and move it to the least occupied channel. most routers come preset to channel 6 or 11 so some other channel may be best for your area. Good luck.
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