I can take a guess and say that the Snail I7 is a mixed bag. Basically, a gaming phone in its own right. It has some compromises due to the target market. If they go Snapdragon or Tegra, the price would be too high to sell without subsidies or finance deals, so they went with the strongest chip that hit the price point, about the price of a new gaming console.
If they would have went with an older Tegra or Snapdragon, they would have probably gotten backlash for going with an under-powered device, but I think for the sake of the fact it is a gaming phone, Snapdragon and Adreno, even an older version would have probably been a better option.
As far as emulators, there must be something running in the background causing the slowdown. Try reinstalling the apps, and starting with default settings. For the Snail W1 and W3D, I used apps right out the Playstore and they worked great. I'd say at about 93 to 97%, but it wasn't an issue for me. It's a 64bit system, so if you haven't, please try Dolphin emulator for Gamecube and Wii emulation.
Also, for those with the Snail I7, Are any of you able to upload the Key Mapper from the system? I don't think there is a root method available yet, so probably not, but if anyone is able to, it'd be much appreciated. Got 5 bucks paypal for ya! Thanks!