is this bitcoin core, knots or btcd?

btcd is slow af and prone to choking on random things, if that's what you are using then at least upgrade it to latest builds...

core is the fastest, on a 100mbit connection on a ryzen 5 2021 it has full sync in under 2 days and probably 3-4 days if you add those indexes, indexes mainly speed up queries so i recommend syncing first and then enabling the index when you can afford downtime