You can use some third party software that might utilize more of your pc. You can google cgminer but most are riddled with viruses and worms that is why we did not recommend it in the first place and we still don't, use it at your own risk!!!
Thank you
BTC3 dev team
I downloaded cgminer 3.7.2 because I read that is the last version that supports GPUs. How do I use cgminer to mine BTC3. What command do I run to get it to work?