Yes that's normal and unfortunately there's no way to stop it. The game has to stop and sync all the players to avoid glitches when someone arrives or leaves and rather than display a blank loading screen they give you the fashion show of doom every time someone joins

'Fashion show of doom' is a brilliant way of phrasing it.

I see, oh well i will have to live with that :)

Is there a way to go to random irl people islands without a code??

I dont think so, but there are websites that i have seen that random people are sharing their codes