asymmetric wireless speeds

I'm puzzled by iperf3's throughput figures.

My sole wireless client is a Dell inspiron laptop (15/3000). I've been checking throughput via our fritzbox 3490 to other machines on our home lan.

Sending data from the laptop seems to be systematically about 20% slower than sending to the laptop. typically ~100Mb/s as opposed to 120Mb/s. It also seems to fluctuate a lot more too.

Can anyone suggest why this might be please?

2.4GHz band, Mint 20.2 on the laptop; mint 20/21, raspbian, freebsd as wired clients. (Just tested, BTW, with the lappy about 10 feet from the AP)
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Mike Scott
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