> load average: 43.42, 39.40, 33.22

Quite high load averages and low %wait time.

面白い。 ここで重い CPU プロセスが発生していますか?

機械翻訳ですみません。

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This is the statistical information of the relay server I am running. The CPU is constantly being used.

Interesting. I can’t give you an educated answer since I’m not database savvy. If this level of resource usage is not expected I would look into table pg_stat_activity to find out what queries are using more CPU resources then optimize configuration or indices.