I see this on lots of sites. Flexslider causes it. Every time the slider moves, text on some other part of the page flickers—on Safari. As far as I know, this is a Safari-only issue. The solution, fortunately, is a little CSS:
-webkit-backface-visibility:hidden;
Just put this on whatever is flickering. It also fixes the annoying lines that grow around the ‘navigation spots’ in Safari.
