I noticed that opening star menu bogs down the game to a standstill. However opening the star menu on an adventure is a lot less painfull
So it looks like the current star menu on home island is too full of items triggering processes and bogging down unity
Splitting it inot separate menus for explorers, buffs and adventures etc might make this problem be lessened and is probably not the hardest programming fix to implement
There are more issues but this is the single one making the game unplayable for at least me- No explorers, no geo's and no self buffing as this takes forever and a day for every click to be processed