Hot answers tagged child-theme
Actually, what you have described is the correct way to do things and there shouldn't be any noticeable impact on site speed and performance. Using child themes also has the benefit of allowing your changes to persist through theme upgrades.
As already stated, the method you are using is the recommended way of doing it. Wordpress is written in such a way that it will always look for a template in a child theme first if there is an active child theme before looking for a template in the parent theme. So coming to performance, there is no impact on performance as these checks are performed ...
Your child theme's functions.php file should be an empty file to which you can add code specific to your child theme. It appears you have copied the functions.php file from the parent theme instead. See this note about functions.php in Child Themes: Unlike style.css, the functions.php of a child theme does not override its counterpart from the parent. ...
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