Wow....just downloaded it...spent 5bucks ....and framerate is choppy.....come on seriously...so it can play smooth on a 512 mhz itouch but not on a 1 ghz. Phone???? Smfh.....i mean its playable...but for 5 bucks....come on...
What game did you buy?
It's not just about the clock frequency of the phone, there's more to it.
Gameloft started developing initially on the iPhone which is using a PowerVR GPU. The next phone blessed with their games was the Pre, which is using, you guessed it, a PowerVR GPU. The reason Gameloft ported to the Pre first was because it was an easy straight port from the iPhone version to the Pre, after all, same GPU, same resolution.
Now they are porting to the Snapdragon Android phones. Higher resolution, and a different GPU, the AMD Z430, which while capable, isn't quite as good as the PowerVR. Also, since it's a different GPU and because Gameloft does quick ports, it's also not optimized for the Evo's GPU. So combine the higher resolution (could be that they just stretch the screen out and not actually render in 480 x 800), with a less capable GPU, with non optimized code for that GPU, and you're gonna see performance issues, and a whole lot of people that don't know what's going on screaming "Why won't my super phone play this game as good as my last phone!!!?"
But yeah, I wish the Snapdragon was accompanied by the next version of the PowerVR, it would have been an even bigger beast!