Since High Sierra the map animation is flickering when moved. I can see that on two different Macs with different graphics card, so I guess it's a common problem in combination with High Sierra (17A405). With Sierra it was ok.
Have the same issue on a 2016 MBPt, with the most recent stable 4.0.3 LS update. I have checked other apps that have similar map overlays (e.g., Deliveries) and haven't seen the same flickering, so it seems like a LS-specific issue.