Smart mining is the process of having a throttled @miner mine when it otherwise does not cause drawbacks.Drawbacks include increases heat, slower machine, depleting battery, etc. The intent of smart mining is to increase network security by allowing as many people as possible to let the smart miner on all the time. For this to work, the miner must prove unobtrusive, or it will be turned off, depriving the Monero network from a little bit of security. As such, it is likely that a smart miner will mine slower than a normal miner on the same hardware.