Background of the issue:
We are trying to build a multi-country and multi-lingual website with a target of 47 languages. We have managed to create 27 different variations, but beyond that, we encounter issues with Menu Sync.
Symptoms:
We are always getting 504 errors when attempting Menu Sync beyond 27 language variations. We have tried increasing execution time and memory, but it is not working.
If this will still not solve the issue, I suggest installing a plugin like "Query Monitor", then check for slow queries and verify if those queries are WPML-related.
I can further offer to create a local copy of the site and test it on a virtual server, if you agree?
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