Modem to Opnsense to Switch to Desktop = minus 9Mbps ?

[Sky22019]

Hello.

This is not urgent but rather something I have been wondering about and thought to ask more experienced folks than me.

So; my network topology first:
Bridged modem -> Opnsense appliance (Intel Celeron J1900) -> Switch -> Desktop PC.
All devices are gigabit enabled and wiring is a mix of cat6 and cat5e. Specifically the wire going from my switch to my PC is Cat5e running through walls.

Bridged modem reports VDSL2 synchronization at 109Mbps (annex b, profile 17a, vectoring).
Speedtest website (and actual downloading) maxes out at around 100Mbps.

Don't get me wrong, I am perfectly satisfied with my 100Mbps.
I am just asking if this fluctuation is normal in the given scenario?

Thanks in advance for any input.

Cheers!

[mimugmail]

This is normal since dsl sync doesnt count IP/TCP/http overheadw