I host an arena server with kits, but this applies to all arena servers that allow you to spawn with weapons.
I was thinking that if when the arena round starts, everyone should be invisible for a configurable amount of time. This will allow people with not very good computers/internet to finish loading into the map before they get killed, since spawning is random, and does not try to space the players out.
Maybe the plugin could use the built in rocket /vanish function, and try to detect large fast player movements (such as a TPA or home, as well as arena teleporting) to see when it should enable the vanish or not.
I am willing to pay up to $7 USD (thats all thats in my paypal right now xd) for someone who can make this plugin.
Thanks in advance.