The other fun thing about AWS instances is that the network uplink speed isn’t always what’s advertised. There is of course the “Up to X Gbps” levels (30 minutes of rated speed guaranteed every 24 hours), but there are also other limits, like cross-region speed being capped at 50% of rated capacity.

This rarely matters until it does, like if you’re setting up an active-active DB across regions. Then it’s a fun surprise.