The flexibility of WordPress can often affect the performance of websites in a negative way. It’s simple to add a feature with a plugin or use a theme that can do everything, but these features and themes add Stylesheets (CSS) and JavaScript (JS) that block the pages displayed because CSS and JavaScript are “parser blocking” by default. The flexibility of WordPress can often affect the performance of websites in a negative way. It’s simple to add a feature with a plugin or use a theme that can do everything, but these features and themes add Stylesheets (CSS) and JavaScript (JS) that block the pages displayed because CSS and JavaScript are “parser blocking” by default. The flexibility of WordPress can often affect the performance of websites in a negative way. It’s simple to add a feature with a plugin or use a theme that can do everything, but these features and themes add Stylesheets (CSS) and JavaScript (JS) that block the pages displayed because CSS and JavaScript are “parser blocking” by default. The flexibility of WordPress can often affect the performance of websites in a negative way. It’s simple to add a feature with a plugin or use a theme that can do everything, but these features and themes add Stylesheets (CSS) and JavaScript (JS) that block the pages displayed because CSS and JavaScript are “parser blocking” by default.