[Risolto] WP Admin Slow When WPML Is Active

Background of the issue:
I am trying to resolve an issue where the WordPress admin area has become very slow. This slowdown seems to be caused by the WPML Multilingual CMS plugin. When I deactivate the plugin, the admin area speeds up. I am using Betheme, which has not caused issues before. Here is a link to a page where the issue can be seen: link nascosto

Symptoms:
The WordPress admin area is slow when the WPML plugin is active. Clicking on 'Pages' takes a long time to load.

Questions:
What could be causing the slowdown?
How can I fix the issue with the WPML plugin causing the admin area to be slow?