Is there any way to increase the speed of gameplay in Plants vs. Zombies? It's a great game, but it can get a bit slow.
Try Game Speed Adjuster.
If using PC, install Cheat Engine and use its Speedhack feature.
If using rooted Android, use SB Game Hacker's speedhack feature.
If not rooted, install VMOS through their website, and enable the "virtual root" feature. That way, you don't have to root your actual phone. Then install SB Game Hacker.
If on iOS, can't help, sorry. You'd probably need to jailbreak.