Why rman backups run longer after creating SEPS wallet?

We recently changed the way we do our rman backups.
We have been running an rman script on the physical standby.
We do weekly 'incremental level 0' and daily 'incremental level 1' jobs, then run 'archivelog' log backups every hour or so.
Previously the rman script would login to the standby and rman catalog and run a host command that would logswitch the primary... like this:
connect TARGET /
connect catalog rmanowner/************@RMANCAT
run
{
host "/usr/local/bin/logswitch.sh";
...

We created a SEPS wallet and modified our rman script to login like this:
connect target /@DBPRD01_SYS
connect catalog /@RMANCAT_RMANOWNER