This has to be told about Android

Or use Cyanogen and wreck even the original Android.

My Samsung isn't laggy. It runs just fine and has never crashed.
It runs pretty damned fast in fact.

I use adw launcher on my s4.

Thank you android robot flying through space on a potato

Samsung is actually developing its own OS called Tizen. Tizen is open-sourced and it's supposed to have a similar look to TouchWiz.