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Wordpress slow since using nginx via Plesk installer

Chris1

Regular Pleskian
It seems that ever since we started using the nginx reverse proxy component on our Plesk 12 servers, applications such as Wordpress is very slow and occasionally gives 504 gateway timeout errors in the dashboard.

Just a simple Wordpress post save can take up to approximately 20 seconds when it only used to a take 3-4 secs before switching to nginx.

Wordpress theme &/or plugin updates occasionally give 504 gateway timeout errors.

We want to take advantage of the static processing and memory consumption savings but not if it results in poor performance in the Wordpress backend.

Has anyone else come across such issues? Are there any settings that may need tweaking to optimize performance?

The Plesk servers are running on VMWare ESXi, sufficient CPU and RAM is available on the host/guests. We are running Plesk 12 on CloudLinux 6.7.
 
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