Badly engineered, multi-purpose WordPress themes are my favorite on that matter. Not only they make you download the entire set of assets ( Think of ~2 icon fonts, half a megabyte stylesheets, megabytes of JS and on top of that 5$ DO box serving all the PHP `magic` ), but also include some entrance animations, which take additional time, before you focus on the content.

Actually this reminds me of the IoT DDoS attack. The low-tech users, making a blog by clicking around and installing 25$ theme are actually unaware that their website drains mobile-bandwidth.

So if you are developing one of these portfolio-with-landing-page-with-blog-section-woo-commerce-supported mega theme, please consider optimizing assets as your next priority.