Max 2017 SP2 here. 28.07 build, I am not experiencing this.
-Is it only happening to you in the newest builds, not in 1.4?
-Is this happening to you only in some specific scene, or in all scenes? (even empty?)
-Can you describe your problem better, or record a short video?
I am only getting a small "preload" for about 1-2 seconds (it looks like it's refreshing the slots in the multi map) and other than that everything is working smooth.