Black lines in cycles render

Hey Everyone,

I am having an issue with these black lines showing in my render. I have rendered several tests over the duration of this project and have not had any issues. Even on models that were already in the scene prior to the issue. I read somewhere this is caused by too many vertices close together. Before I render this thing again, I wanted an expert opinion on the problem. Any suggestions will be greatly appreciated.

Thanks in advance!

So the black line on the fence post was caused by a duplicate object. It doesn’t not appear to be in my render anymore, but it’s still a bit early to tell. The dots on the window I still can’t figure out. I’m about to leave work and will let this render overnight and see what happens.

Could this be a performance issue of some sort? My work computer that I have been using is a 4 year old iMac. I have rendered this numerous times with no issues until now. But it has become more complex with each render. Could I be maxing out the computer or something? I am rendering with CPU.