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Problem:
When installing WPML String Translation on a WordPress multisite, the site experiences significant performance issues, using excessive RAM and CPU, leading to MySQL crashes. Additionally, the beta version dropdown is missing in the 'Commercial' section of the plugins page.
Solution:
First, ensure you are using the latest version of WPML String Translation by checking the changelog at WPML String Translation Changelog.
If you encounter crashes, enable debugging on your site to identify specific issues. Modify your wp-config.php file:

define('WP_DEBUG', true);

define('WP_DEBUG_LOG', true);

This will save error logs to a debug.log file within the /wp-content/ directory. For detailed instructions on enabling debugging, visit Debugging WPML.
Since the beta version is not currently available in the 'Commercial' section due to it not being publicly released yet, keep an eye on WPML Changelog and WPML Announcements for updates on new releases.

If these steps do not resolve your issue or the solution seems outdated, we recommend opening a new support ticket. We also highly suggest checking related known issues at WPML Known Issues, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. For further assistance, please contact us through the WPML Support Forum.