When I select a menu link the active link does not display properly.
Hmm, can you elaborate on this. The menu looks fine to me.
When I change page to the Module Variations there is a huge gap on the right hand side.
Can you provide a screenshot. All i see is some more space on the right when i'm using portrait mode, landscape mode is fine.
Seems sluggish and slow to scroll with but I guess that depends on the amount of active modules there are on the current page.
It's fast for me on my Samsung Galaxy Nexus with Android 4.2.1