I use 1 code, the x2 coins, and now i can't get the full 100%. Mr. Fantastic F.F didn't apear in the map anymore. What can i do?

in the open world my game starts lagging, what i have to do to stop?

I bought to the game and tried playing but when sandman builds a sand wall in front of me i have to change my hero but i can't open character menu. I'm stuck with Hulk and Tony in that level. Also minikits require other characters to obtain and because of the same thing i can't obtain them as well. I googled it and it says keep press "u" button but it only changes my hero to other one. how can i fix this?...

Every 30 seconds or so i get a fps drop making the game unlayable, does someone know how to fix this? Thanks

So when I first created a new game it took too long until the first scene coming out. Then, I spent 1 or 2 hours playing (taking too long when the game "saves") and when I closed the game and returned, I found that it didn't save anything. I've tried multiple times, but I can't save my progress, sorry for my bad english...