Logs will clear itself according to the Settings - however, the more Events, you are turning on, the more often you will Need to check growth of EventLog and Exceptions tables in the database. Please check growth of ScheduleHistory table as well.
most of the Events are not Performance related, because there are factors, which are not covered by the Events: Database Transactions and Client side code.
For Security, have a look at the Security analyzer (in Admin Menu / Persona Bar).

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Cheers from Germany,
Sebastian Leupold

   

Speed up your DNN Websites with TurboDNN

You are welcome, have fun using DNN :)

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Cheers from Germany,
Sebastian Leupold

   

Speed up your DNN Websites with TurboDNN