Something is slowing the game to a crawl a couple of turns into combat on my android phone. I cannot tell you more as I don't know what's causing it. Maybe it's a card I added to the deck? Maybe it's coincidence. Restarting the game somewhat helps and there's a chance that I'll finish the combat without slowdown, but it's almost guaranteed every fight. I can also be in fact webbed even though I have the leaf that says I can't be.
The leaf item should be fixed now.
I've noticed the slow down on my android phone before as well. There was an update a while ago to try and resolve it and the latest update should be better performance wise. But it's clearly still an issue on some devices and might still be there. It's likely a memory leak, which is a pain to track down.
If you don't mind, can I ask what android phone you have and roughly how many battles you can get through before the slowdown. Hopefully I'll get a better look into what's going in the next few days.
It's a Hammer Android Phone. The slowdown can happen as soon as the second battle encounter, but I think I've managed to see a connection between how many items drop and how many consumables I get. If I get too many fruit the game seems to slow down but If I see nothing but Items the game seems to be a bit better. I think. I could be wrong.