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First one of them plugins better be worldborder, to reduce lag of people leaving spawn in and infinite number of directions.
Second 5 people you dont have the ram to offer that many plugins with more than that!
Players at the same time, plus yourself
The problem is that the internet connection speed is too slow to send and recieve data the data for more than 7 people at the same time.
You're probably better off renting a server instead to have a decent experience.
http://canihostaminecraftserver.com/