How to determine if any benefit is obtained by enabling multi_threaded_setup and disabling SSL?

We're still in the testing phase but it looks like we're not seeing any performance benefit to disabling splunkdSSL and enabling multi_threaded_setup. I understand that multi_threaded_setup requires "a lot" of search peers to provide any gain, but I would have expected that disabling splunkd SSL would have given us some kind of performance boost.