Please note the basic wallet miner, needed to be as universal as possible.  So out of the box, it may not be as effective until you experiment with some of the Flags, which can help to get more hashrate.

Some find using the 3rd party miners to be even more effective.  Due to the array of CPU architectures out there, it will take a little trial and error to dial in you best settings.

Personally, I just use the wallet miner, no flags...  Too lazy.