5 Wilds, payout for 5 scatters is fixed to 500x no matter how many lines you play except you hit 5 scatters on free spins as it gives you 1500x. 5 Wilds gives different payout/multiplier based on how many lines you play. The less lines you play, the higher payout you'll get if you hit it (max 10,000x on 1 line). Talking about the fast/instant spin mode, I prefer not to use it because it is just too fast so it gives less sensation while playing the game.