Project: QGIS
Version: 2.16.0
Support was added to set the segmentation tolerance (maximum angle or maximum difference). This setting controls the way circular arcs are rendered. The smaller maximum angle (in degrees) or maximum difference (in map units), the more straight line segments will be used during rendering. You can find this option in Settings -> Options -> Rendering -> Curve Segmentation.
This feature was developed by Marco Hugentobler