I thought the game was just slow because it was loading ads in the background, because turning off my internet prevented ads from loading and the game ran much faster and much more smoothly. But having to constantly switch off my internet to play this addicting game was annoying, so I bought the remove ads purchase and... still slow. No ads when online, but still painfully slow. Much better off just turning off my wifi before playing. Will continue to play offline.
If you learn anything from reading this, it's (hopefully) to switch off your internet before playing. You'll still get a banner ad for their other games but no pop-up advert interruptions, and as a bonus the game will run smooth. Removing ads is NOT worth the 3.99 and makes no real difference in how the game runs, (of course, it's never worth more than 0.99 (imo, pretty greedy to push for much more) but I was curious as to whether or not ads were truely the cause of the slow game), and you can effectively do the same thing for free by clicking off one setting in your device.
Don't overfeed the pigs. G'day, all.