Menu flickering with each refresh on Google Chrome [closed]

Looks to be a case of flash of un-styled text as you are using “Archivo Medium” from Google Web Fonts for your menu.

There is a CSS property font-display which would help in your case, however the Google Webfonts don’t use this currently. There’s an issue which raises this on GitHub.

There are a few workarounds, which would be better explored on StackOverflow (as this isn’t a WordPress issue), but you could take a look at this article from TutsPlus. It makes use of the TypeKit webfontloader.