The link between the lounge and bedroom datacentres must take a pounding in your parents house 
More than two links, there is a dedicated link to the two offices, my office currently has a max of 1Gbps the other office is on 100Meg. Ran out of ports on the gigabit switches so grabbed an old HP Procurve 24 port with POE that can only do 100 Meg. I do have to say that there is a noticeable difference between opening some files in one office compared to the other, a perfect example was when I did some video editing for someone and everything was fast and responsive in premiere pro with some RAW 4K footage then in the over office it just lagged about whenever i moved playhead.
Thought I would add, I have since added another NAS to replace my old 12TB (RAW storage) 6TB in raid Synology DS216J with a Synology DS920+ with four 6TB Seagate ironwolf Pro's 24TB RAW, 12 TB in raid 10 (i think).
I might add some M.2 SSD's for cache in future. (No need at the current time)
The reason for the change in NAS is because the DS216J was underpowered and was struggling. Now things are running a lot smoother, logining in is faster and drives are mounted correctly without having to log in and out every so often when explorer or the automatic drive mounting script would just freeze on logon as the NAS was struggling.
The old DS216J is now used with hyper backup and is in my office, it does daily incremental backups at 3AM. The new NAS set up works a lot better than before, the network is the bottleneck.
I mean look at
yesterdays BMQ Virgin Media had some serious issues.
Many Thanks,
RR-THE-IT-GUY
Virgin Media M100
Talktalk 2014-2018 → Virgin Media Vivid 50 2018-2019 → Virgin Media M100 2020-2022