7 Days to Die is a great game but lacks optimization. If you are having FPS issues please post screen shots of your video settings here and we will do our best to assist you and get you running smoothly.
Here is my current video settings, in low data areas I run 40-70 frames. In high data areas i.e. cities and large builds, I run between 20-40 frames.
Remember if you bottom out at 3-7 FPS going to your video settings and hitting apply usually helps. If not I suggest restarting the client.