Current WordPress core is version 6.7+. Divi 4.9.3 is with Block Editor (Gutenberg) features, modern site health checks, or recent database schema changes. You will see broken layouts and missing options.
One of the biggest criticisms of early Divi versions was performance. However, made significant strides in optimizing load times. Divi v4.9.3 - Elegantthemes Premium Wordpress T...