The sync_binlog server variable controls this behavior. The default of 1 means to fsync every time, which is best for durability but worst for performance. See

The sync_binlog server variable controls this behavior. The default of 1 means to fsync every time, which is best for durability but worst for performance. See https://dev.mysql.com/doc/refman/8.4/en/replication-options-binary-log.html#sysvar_sync_binlog https://dev.mysql.com/doc/refman/8.4/en/replication-options-...