Sculpting - Unwanted lines on brush strokes While sculpting, I get these lines on my brush strokes. This particluar example was made with Clay Strips. With other brushes it's not as noticeable, but it's there too.
I don't know if this happens because of some limitation of Blender itself, since the model has a lot of polygons (720k tris), and it may be "lagging".
Is there a way around this?

Thanks!
As you said, it may be because of the low resolution.  Usually with Sculpting Mode, you'll want to use the Multiresolution modifier so that in sculpting mode you can have a high resolution while in object mode the resolution won't slow you down too much.  You can also check you brush settings, particularly Texture and Symmetry/Lock.  In Stroke settings, you can make sure that the spacing is set to 1% and the jitter to 0.