I know this has been said before but id say this is the single biggest issue with the ea right now so it's worth repeating. Big battles of 10+ enemies consist of nothing but tabbing out between your turns, using an ability and then tabbing out again.

Sadly I dont think this is an issue that will be fixed by making the enemies turns faster. Rather, since the game is designed around smaller fights and works very well with them, that is the only type of fight the game should give you.