I agree with mhfd1's point, the UI currently doesn't display crucial data like how many PPs the opponent can have, their known moves, items, type effectiveness - there's a lot of things we have to take into account and 15sec isn't enough to make a good decision. I understand that those 5mins are supposed to give you time to think, but that's stressful and will punish players who tend to play longer games. I think it should be increased to 20sec and come with better battle UI that would show the information Showdown does.