Hello,
From what I experience with Start11v2 on latest Windows version, it just need sometimes to load up things when you first boot up your system and opening your Start menu for the first time. It will take longer time to load things if you have a lot of icons to load and display. And if you use lots of custom tiles please make sure it is design as small as possible to your liking. Please don't just use large graphics as a tiles. Obviously Start11 will shrink it to size, but the process will take some time to load, shrink and apply those large tiles graphics. Also, please try to put those graphics file locally so it can be load quickly. Network/external drive will take extra time to load.

Thank you.
Basj,
Stardock Community Assistant.