What things can influence log_shipping_monitor_secondary - last_restored_latency values?
Most significant variable is the size of the transaction log backup that you are trying to ship, larger files :-
take longer to copy,
longer to restore &amp;
more time to create the standby file.
If tlog backup size doesn´t explain more than 90% of the variation then you can start to troubleshoot whether server CPU or network congestion is involved.