Network congestion determined by various causalities. It would gets increased on night to early morning in general. You can pick any node that shows lower RTT avg/stdddev with flat graph to optimize your connection except the game has been region restricted. https://mudfish.net/docs/en/faq/nodes.html#should-i-use-the-basic-mode-and-set-the-better-node-near-game-server-location .