The fact is that I a not confident with that :
all the players who get problems are freezing at 72%. They do have computers and configurations very different. So the problem is not the computer, but the instruction which is running at 72%
I have lost quite all my friends : https://gyazo.com/78345ae0186d499b887487fe4e0734c5. This has nothing to do with a computer too weak. The devs have a problem for transfering the game from flashplayer to webgl. So some instructions are freezing the game...