It’s funny how we have had 18 years of talk about best servers for the SN and only 1 month and 4 days about routers and the only thing that’s relevant really today is the router.
On Linux the tc command can shape traffic at the source and make life a little less stressful for the router. See here for a start and please share your config if you find a good one. (Reducing those crazy bandwidth swings through traffic shaping needs to be balanced against node health…)