Dear kris,
Initially, when you notice your application's performance slowdown, in Designer, you can check the list of active users (Administration > Active users) to locate the names of running jobs. Also, in Designer, you can investigate the content of the event log (Administration > Event log), in particular, to check the transaction status of the jobs. Then, you can turn to investigating the technological log to get further details on the jobs you suspect in slowing down your application.
Best regards,
Vladimir Gurov