I've noticed that my fully functioning PC full of M2 SSDs, connected with gigabit ethernet to a gigabit switch, along with a 4 bay HDD NAS connected with gigabit to the same switch, my Macbook Air M1 2020 (using AX wifi) is always considerably faster (50-100% faster) copying to the NAS than the PC, even though the NAS is full of raid5 HDDs while the PC has much faster M.2 drives. The NAS can be copied to at full gigabit speed (1 gig gets copied every 10 seconds at ideal speed, when my laptop is right next to the wireless router) while my PC takes 15-16 seconds per gig. On the meshpoint, it's 20-30 seconds per gig to the NAS and 50-60 seconds per gig to the PC SSD. The PC has no performance issues with respect to the SSDs (they copy at 3500mb/s). The PC has fast access to the internet and NAS (full gigabit speeds), the max theoretical speeds - nothing wrong with its inherent ethernet performance.
Router is Amplifi Alien.
Router is Amplifi Alien.