You need to tell us more about your miner. Is this a CPU or GPU miner? What is the model of the GPU? Setting of the miner?
It is a CPU miner. I did not tweak the settings of the CPU, for I do not know how to do that. I was thinking about buying a GPU, but I do not know what to look for and how much I should spend.
If your CPU supports AES-NI instructions, you can mine Monero or BCN. I would suggest Monero as it is fairly launched and has bigger user community.
But don't forget the minimum amout /tx fees or Monero.
For CPU mining I think a coin like BCN (at Minergate) or XMG (https://bitcointalksearch.org/topic/ann-xmg-magi-cpu-mining-mpow-mpos-magipay-735170) would be better than Monero. Too many GPUs already in.