System Information
Operating system: macOS High Sierra

Blender Version
Broken: 2.80, 351f537fa83, blender2.8, 2018-12-15

Short description of error
Cycles renderer renders mesh too big.

Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).
Switch to the Shading tab, set the renderer to Cycles, and switch the view to Rendered View. Attached is the .blend file and a screenshot.