ログに以下のメッセージが頻繁に記録されてる。
[19:53:18] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 2067ms behind, skipping 41 tick(s) [19:54:36] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 2240ms behind, skipping 44 tick(s) [19:54:53] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 4224ms behind, skipping 84 tick(s) [19:55:24] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 14840ms behind, skipping 296 tick(s) [19:55:38] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 9480ms behind, skipping 189 tick(s) [19:56:06] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 20215ms behind, skipping 404 tick(s) [19:56:10] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 4398ms behind, skipping 87 tick(s)
RAM 512MBという非力サーバーゆえ、処理能力が足りないんだろう。プレイヤーが言うには、操作してから反応するまでのタイムラグは若干は感じるものの、プレイに支障があるほどじゃないらしい。とりあえず現状のまま様子を見る。
参考サイト
[Warning] Can’t keep up! Did the system time change or is the server overloaded? – Minecraft Forum
http://www.minecraftforum.net/forums/support/server-support/server-administration/1931228-warning-cant-keep-up-did-the-system-time-change