This thread is resolved. Here is a description of the problem and solution.
Performance issue happens with these symptoms: Translations sometimes are not saved to the database. CPU-Usage is up to 100%.
The latest version of WooCommerce Multilingual (220.127.116.11) solved this issue. Please update WPML and its add-ons to their latest versions.
This is the technical support forum for WPML - the multilingual WordPress plugin.
Everyone can read, but only WPML clients can post here. WPML team is replying on the forum 6 days per week, 22 hours per day.
Our next available supporter will start replying to tickets in about 1.20 hours from now. Thank you for your understanding.