I paid a few bucks for the app, but then unlimited flash. The biggest problem/disappointment is that I can't mirror with Apple TV using Puffin - so I still would like to solve the crazy slow download mystery. I did try turning it off, and closed all the apps. Still no improvement. I thought maybe it had to do with an iOS update, but then I probably wouldn't be alone with this issue. I figure I'll just keep trying every now and then and see if it fixes itself.
Thanks for your help trying to troubleshoot this, I really appreciate it.