Does UI affect SEO?
Google's algorithm and other search engines pick up on UX elements, sometimes tying them to ranking factors. In these cases, the site architecture and usability of a site can make or break technical SEO. Sites with a strong UI/UX that caters to searchers' needs is more likely to perform well in SERPs.
What is UI clutter?
Clutter is a discontinued GObject-based graphics library for creating hardware-accelerated user interfaces. Clutter is an OpenGL-based 'interactive canvas' library and does not contain any graphical control elements. It relies upon OpenGL (1.4+) or OpenGL ES (1.1 or 2.0) for rendering,.