When good front-end optimization goes bad: How to make sure your site tests well AND looks good

There are a lot of ways to optimize a page at the front end, and while some of these techniques can give you great-looking RUM and WebPagetest results on paper, they can also mess with how your page actually looks and performs. These days, I’m seeing more and more sites that test well but perform poorly. Here are two tips to make sure this isn’t happening to you.