Nah, that is related to GSS stylesheets on the site making use of the matrix3d part of CSS. Unfortunately lots of (expecially Linux) 3D drivers are not exactly up to the task.
Edit: as for required login, that isn't needed to play with just the examples.
I can play 3D videogames with lots of advanced shaders and even develop my own, perform very demanding computations on my 8-core machine and watch HD movies and stream from the web, yet I can't easily view a simple home page from the internet?
Yeah, it is a shame. I'm getting some checkerboarding there too as my Chromebook Pixel can't always keep up with rendering the surfaces when scrolling quickly.
Funnily enough my (a lot slower) Nexus 7 scrolls much better. That is what points me towards 3D drivers.
But anyway, shall we talk about Flowhub itself? ;-)
Is this the state of technology in 2014?