SolveSpace version: 2.3
Operating system: MacOS 10.13

When sketching a circle it seems like the rendering accuracy (i.e. how many line segments it is split into) depends on the physical size of the circle, rather than its on-screen size. The result is if you draw a small circle and zoom in it looks like this:

I.e. not very circular. Nobody is running this on a 386 so I would suggest as a simple hacky fix just increase the minimum number of segments from 8 to something a bit more reasonable like 128.