Internet speeds are the least of your concerns if you're considering moving there because you've got fantasies of tropical paradise and tax free trading. It's a love it or hate it kind of place. You may well be lucky and be one of those who loves it, but odds are against it if you've lived your whole life in CONUS. Trust me, take advantage of the pandemic to go live there for 6-8 weeks while doing your regular daily routine living in an apartment similar to what you could afford to rent if you lived there. It will be an adventure, and even if the end result is that you realize you could never actually live there, it will still be a great experience you'll look back on fondly.
No, I lived in HI which was bad enough. I have spent several weeks in both PR and USVI and based on my previous HI experience I could tell they weren't for me. That said, there are definitely people who love it. You just have to really really be a live and let live guy so when people graffiti your house, dump garbage in your yard at night (in a neighborhood of $750k houses), and block off parts of the beach to set up their drug markets you can honestly let it roll off your back. Places like BVI and Bahamas family islands have a little bit of this but everyone cares and does their best to stop it so it doesn't really bother me. PR and USVI (and Ohau) seem to have just given up. I'm not wired that way, but I certainly know people who are and honestly they're probably happier than me so it's good luck if you are.
If you are planning to spend any time at all on St. John, don't forget to take a couple cases of mosquito repellent with you -- enough to bath your entire body in it.. Demand may have pushed price up if you wait until you arrive to buy it.
I live in The Westin St John a couple of weeks yearly
