The tuninng guide contains section about transaction subsystem tuning (12. Transactions Subsystem Tuning) where the guide shows chaning transaction object store from filesystem to journal one

/subsystem=transactions:write-attribute(name=use-journal-store,value=true)

it would be beneficial to mention that the journal store by default runs in NIO mode where native libraries are not used. For getting better performance switching to AIO (asynchronous io) is recommended. To switch the journal store setting to use AIO you can use the cli command

/subsystem=transactions:write-attribute(name=journal-store-enable-async-io, value=true)