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Problem:
After migrating to a new hosting, a WooCommerce store operating in three languages experienced significant slowdowns when WPML String Translation was enabled. The site's admin pages often timed out, and there were heavy database queries on icl_strings and icl_translations tables. Additionally, the Advanced Translation Editor (ATE) failed to authenticate, showing repeated auth_error logs.

Solution:
To address these issues, we recommend the following steps:
1. In your WordPress dashboard, navigate to WPML → Settings and check the Translation Editor section for any prompts about reconnecting.
2. Disable string tracking and adjust IDs for multilingual functionality.
3. Use WPML's troubleshooting tools to optimize and clean up string tables, clear invalid and unused strings, and remove ghost entries.
4. Consider using caching plugins and database/object caching where possible.
5. If these steps do not resolve the performance issues, we suggest creating a backup and sharing access credentials with our support team for further investigation.

Please note that this solution might be outdated or not applicable to your specific case. We highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If the problem persists, please open a new support ticket at WPML support forum for further assistance.