Not really as optimal settings are entirely dependant on who/what the user does with their system.
As for the recommended settings, the avast default settings, which provide the best balance between protection and performance.
As for optimal settings, you have been using avast for long enough to get an idea of how the default settings work for you and your system. Then it is a case of checking the avastUI, Help Center link and check out what the settings are and how they might impact on your system.