You can tune well the logical standby apply process with various parameters,


MAX_SERVERS	# Set the MAX_SERVERS to 8 x the number of cores
	execute dbms_logstdby.apply_set ('MAX_SERVERS', 64);

MAX_SGA	# Set the MAX_SGA to 200MB 
	execute dbms_logstdby.apply_set ('MAX_SGA', 200);

_HASH_TABLE_SIZE	# Set the Hash table size to 10 million
	execute dbms_logstdby.apply_set ('_HASH_TABLE_SIZE', 10000000);

Preserve commit order	# Set the PERSERVE_COMMIT_ORDER to false
	execute dbms_logstdby.apply_set (name => 'PRESERVE_COMMIT_ORDER', value => FALSE);