I think that the problem with the delays of today roms doesn't have to do with xiaomi.eu. Problem is that ROMS isnt available at the official site of miui.
So we have to wait !!!
I have stop to use Antutu because everytime the results is different. I believe that if you feel that your phone is smooth then you dont need to check it with Antutu.
I confirm this problem also on Mi4c, the problem exists isn't permanent, some times i can see picture of a contact, on incoming call and some times i cannot (Same contact !!) . I dont have any problem on call outs
I think that is better than 6.4.14 (more smooth) The only negative is battery draining which is faster than any other developer rom. Actually i never had big battery drains with any developer rom as this one.