\t
select wait_event_type, wait_event from pg_stat_activity where pid !=pg_backend_pid();
\watch 0.5
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[Postgres] Solve PostgreSQL DataFileRead and buffer_io with Parameter Tuning
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[Postgres] Tuto tuning
This site helped to resolve IPC wait event : Postgres checkpoint tuning | Tembo Docs
You have to adapt the checkpoint_timeout within the max_wal_size.
If the max_wal_size is 8Go then you can increase the default value of checkpoint_timeout (which is 5 min).
For big database with big wal size, you need to increase the checkpoint_timeout to avoid IPC wait event on the Buffers.