/LI
><LI
><P
>        Allow group commit to work effectively under heavy load (Peter
        Geoghegan, Simon Riggs, Heikki Linnakangas)
       </P
><P
>        Previously, batching of commits became ineffective as the write
        workload increased, because of internal lock contention.
       </P
></LI
><LI
><P
>        Allow uncontended locks to be managed using a new
        fast-path lock mechanism (Robert Haas)
       </P
></LI
><LI
><P
>        Reduce overhead of creating virtual transaction ID lock