WF on Epix 2 is very slow

Hi

my WF works on 15 devices or so. But on Epix2 it updates the display very slow. Instead of each second it is each 13th second?! 

Is there a known issue? Any difference to a venu or fenix7 or my va4, that I missed?

I am not a pro. And its a lot of code. In the sim it works fine. And I dont have an idea…

Thanks for any help

michael