Depending on your Mac setup this may also make your UI speed far worse; causing sluggish, lagging behaviour that makes Renoise unusable.* OSX: New macOS Metal based GUI rendering to improve UI speed, especially on Retina Displays and with some color profiles
Metal based GUI rendering is turned on by default.
Fortunately, it can be turned off; by deselecting "Use Metal based GFX rendering (when available)" under Renoise Preferences - GUI