ground.  Often
         that will result in greatly reduced transaction latency, but there
         also are some cases, especially with workloads that are bigger than
         <a class="xref" href="runtime-config-resource.html#GUC-SHARED-BUFFERS">shared_buffers</a>, but smaller than the OS's page
         cache, where performance might degrade.  This setting may have no
         effect on some platforms.
         If this value is specified without units, it is taken as blocks,
         that is <code class=