I'm having the same issue, no mods and ran the integrity check...no help.
Intel Core i6700HQ processor
NVIDIA GeForce GTX 1060/6 GB GDDR5
Hmmm ... I am not experiencing that issue.
Late 2015 27-inch iMac, Core i7-6700K, 32GB RAM, MS Windows 10 Pro [64-bit v1703] and dedicated 4GB AMD R9 M395X running 17.4.3 with latest MOD pack from Quickybaby over wired 150Mbps Internet connection running HD Client at 2560x1440 full screen with High graphics settings
Perhaps lowering your graphics settings...