For me, I run a server for up to 10 players hosted at home. Normally, there are 3-4 players on at a time. Only 9-10 when we do a boss fight for the first time. Lag is very minimal. My internet provider is Telus and I'm subbed to the Fibre Optic 150MBits up/down plan in Metro Vancouver.

The computer specs:
- Mini-PC
- Windows 10 Professional
- Intel Celeron J4125 (4 Cores/Threads)
- 8GB DDR4 RAM
- 120GB SSD

100% vanilla, no mods. I connect to it via Remote Desktop whenever I need to do stuff like back-ups and stuff. My wife and I watch Netflix from it via HDMI to the television, while the game server app is running, and no one has reported any heightened lag on it.

PS: my dog walked up to me just now, brushed his face against my leg, then as I went down to pet him, he sneezed right into my hands... Wonderful.