This has been a problem with Max for as long as I remember
If you switch between vertex/edge/poly/ etc etc in edit poly mode, the lists of buttons underneath disappears, then slowly scrolls out again. It takes approx 2 seconds, but I believe these five buttons are the most used part of 3D Studio Max - and the UI interface is sloppy.
Is there any way to get this sped up, or instantly - if not, can someone show me another application that does the same thing, $3 or $3000? It makes no sense to have it working this badly in 2019.