As the distance from camera to an object increases the apparent size of the object will decrease, in perspective things farther away always appear smaller.

The only way to prevent that is to use an orthographic camera or keep all lines the same distance from the camera.

As for increasing samples to get a clean result - that is the nature of cycles. It depends largely on the material and world settings. If you are using simple colours then the blender internal will be just as easy to setup without having to adjust sample amounts.

You can also adjust the resolution of both the bevel and curve to get smoother surface results instead of converting to mesh if the surface of the curve is not smooth enough.



How to render a curve without creating meshes?
I just got a Samsung Galaxy S3 that runs Android ICS 4.0.8. When I connect the Galaxy S3 to my Mac laptop and use PDAnet to tether, I often get this popup on the Galaxy S3 screen:



Tethering via PDAnet works great, but the popup can get annoying. I can close the popup, but it comes back a few seconds later. 
How can I get rid of this popup permanently?
