Press L to do a Lag Test. If the stated number is 1, it will be laggy. If 0, it will not. More severe lag will be added at some point. (Lag will be separated in levels, and will change randomly between 1-3, as long as it's not on zero.) Otherwise, you know how it works. Click the buttons to open apps, drag the buttons around. Do NOT click the buttons twice! It will break the app you're using and make it really pixelated!
I made all this myself :) (unfinished. I still have to make the store) Remix and make your own apps if you want to!