It’s not even the speed. It’s also the content. All from all instances seems cool until you can’t read 80% of it because it’s in another language. I’m glad those instances exist but when I have to scroll through 5 posts to see one I can read, and it’s some low-effort post (on average) the experience is not a good one
Even after all that work, you’ve gotten through 3 seconds of the world’s timeline
Local is a good one, if your instance is lively enough. Then you can add people and see boosts and your world grows nicely