Lost connection: Timed Out

Good morning, the server core is spigot, but on bukkit the problem is the same. I do not have a large server for playing with friends, from the king host site, most players can safely log in and play, but there is one that cannot log in. At the entrance, it lingers in the world and on the server, but at the same time it stands still. At the same time, everything is frozen for him and nothing moves. After some time, he throws it out because of an exceeded waiting time. His Internet speed is worse than ours, but at the same time allows you to go to other servers. We tried to increase this time-out by the argument "-Dfml.readTimeout = 90", but now it expels even faster. Please help if this is possible to fix.

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