I'd send a video of the upgrade screen but I cant get to it lol. Since posting my original comment I've only progressed from 2:00 to 2:06. So it's probably more like .5fps lmao ahhh I have so many upgrades :(
Oh wow, even when the game lagged it didn't lag that bad! Let me look into it...
If you want to restart the game, it won't load your game again, but there is a cheat you can unlock by pressing:
u d l r a b s
on the menu screen (in the upgrades, the up arrow will give you 10k coins each time you press it)