Simplicity is not the goal. It is the by-product of a good idea and modest expectations.
When setting an element’s position to fixed, make sure you add to the CSS class the following attribute: backface-visibility: hidden; (don’t forget to add the provider’s prefix. e.g. -webkit-, -o- etc) or translate3d(0, 0, 0); This will prevent browser re-painting it on scroll and hence increase performance.