Aside from top of the line Oahu optimization work, the majority of the themes and plugins for WordPress has substandard code. The result is frequent functional issues that result in website sluggishness or downtime. Another very frightening issue is the intentional and unintentional security problems that stem directly from faulty themes and plugins. Bloated code is also a problem. The WYSIWYG editor produces bad HTML, and most themes and plug-ins are bloated, so you need to install HTML/CSS/JS minifiers. But don’t get the wrong ones or they’ll kill your CPU by modifying every request! While big wins exist, there are no quick fixes.
Our resident developer is not only obsessed with such optimizations, but fully versed in programming Wordpress functions, in other words themes and plugins from scratch.