To sync my files between devices, I use Synthing 1.19.2 [ST].
One on my Laptop(QOS) debian 12 as well on Desktop(QOS) debian 12 and one in Android Device (fork).
All my computers and telephone are connected by cable to one router with OpenWRT Telephone is connected by wifi 5GHz to the same router. Router further is connected to my Modem from ISP.
When using S.T. I get used to uploads going max 2Mbps between pc and my telephone.
One time I when running Linux live Environment with S.T. and I was surprised that up/dl was around ~90Mbps, but on Qubes I never saw this high numbers. When higher speed was achieved laptop with Live System was connected by cable and telephone using WiFi 5GHz What I have to do, to get that kind of speed ?
Is it difficult to set it up ?