I observe the same unexpected low 75-80 MB/s read speed (writing at 110-115 MB/s @20-30% CPU load) no matter if the filesystem is f2fs, ext4 or exfat, on my QNAP QHora-301W with USB3 SSD connected to the USB3 port.
I'm using fully NSS (including NSS wifi offload) accelerated build for IPQ807X.
Sandisk SSD mounted using ksmbd in my case. This SSD can write/read at above 1000 MB/s if connected to a PC directly.
So definitely there is something wrong. I don't think it's a hardware limitation.
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