This really should be marked as a bug fix, considering it affects TONS of Webflow sites that use these common effects.
See: http://forum.webflow.com/t/blurry-images-on-non-retina-screens/23383
Or this specific page: http://tempsandbox.webflow.io/test3 (try on Chrome)
@cyberdave, is the Webflow team aware of this issue?