Performance
Lag has more than one cause, and the fix depends on which one you have. The server can be slow to calculate the world, short on memory, or fine while the connection to a player is not.
The article below shows how to tell them apart with what the panel already measures. The guides next to it go deep on each cause.
Performance articles
Delivery: most servers are handed over instantly and run within seconds of payment, the rest follow within 60 minutes during the day and within 12 hours at night.