Blurry Gravatars
On retina screens the gravatar icons look blurry in some places because they are not fetched with the correct (double) resolution. See the attached screenshot for an example. The image size as displayed is 46x46 points, so the 92x92 pixel image should be fetched from gravatar. I would argue that GitLab could possibly always download a larger version and scale that down, even on no-retina screens. Using the same image size everywhere would also conserve bandwidth due to the caching taking place.