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Problem:
The client reported significant slowdowns on their website when WPML was enabled, despite having a high-performance server setup. The site performed well without WPML and with fewer active plugins, but slowed down considerably when more plugins were activated alongside WPML.

Solution:
We conducted a series of tests to isolate the issue, including updating themes, minimal plugin activation, and detailed performance monitoring. It was determined that the performance issue was not caused by WPML itself but by a third-party plugin, specifically 'Ultimate GDPR & CCPA'. This plugin was found to consume a significant amount of runtime due to a function running a regex callback on numerous posts, which severely impacted site performance. We recommended deactivating this plugin or contacting its support for a resolution.

If this solution does not resolve your issue, or if it seems outdated or irrelevant to your case, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix,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 problems persist, please open a new support ticket at WPML support forum for further assistance.