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Problem:
You are experiencing slow site performance when WPML is enabled on your website.
Solution:
We recommend following these steps to identify and resolve the issue:
1. Create a full backup of your site or set up a staging site as a copy of your production site.
2. Update any outdated plugins or themes.
3. Flush any existing cache memory.
4. Deactivate all plugins, including WPML plugins.
5. Activate a default WordPress theme, such as Twenty Twenty.
6. Reactivate the WPML plugins.
7. If the performance issue is resolved in this minimal setup, reactivate your theme and then other plugins one by one to identify the problematic component.
Additionally, we suggest increasing the WordPress memory limit to 512M by adding the following line to your wp-config.php file:

/* Memory Limit */<br />define('WP_MEMORY_LIMIT', '512M');

Add this above the line /* That's all, stop editing! Happy blogging. */

If these steps do not resolve the issue or if the solution seems outdated or irrelevant to your case, please check related known issues at https://wpml.org/known-issues/, verify the version of the permanent fix, and confirm that you have installed the latest versions of themes and plugins. We highly recommend opening a new support ticket for further assistance at WPML support forum.