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This thread is resolved. Here is a description of the problem and solution.

Problem:
The client installed WPML on their website and experienced significant performance issues. The site became slow and unresponsive, and disabling WPML restored normal performance. The issues persisted despite updating plugins and themes, and the WooCommerce Force Default Variant plugin and the theme Savoy were suspected to be contributing to the problem.
Solution:
We recommended the client to update all outdated functionalities and provided a checklist to enhance site performance, available at https://wpml.org/forums/topic/how-can-i-improve-performance-of-a-slow-site/#post-15350474. We escalated the issue to our 2nd tier support for deeper analysis. It was found that the WooCommerce Force Default Variant plugin and the nm_template_loop_attributes function in the Savoy theme were causing the issues. We advised against using the WooCommerce Force Default Variant plugin and recommended upgrading WPML plugins to the latest version for performance improvements.

If this solution does not resolve your issue or seems outdated, please check related known issues at https://wpml.org/known-issues/, verify the version of the permanent fix, and confirm that you have installed the latest versions of themes and plugins. If problems persist, we highly recommend opening a new support ticket at WPML support forum.

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.

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This topic contains 2 replies, has 1 voice.

Last updated by Carlos Rojas 2 weeks, 3 days ago.

Assisted by: Carlos Rojas.

Author Posts
February 27, 2025 at 1:12 pm #16756162

lonnekev

Background of the issue:
I've installed WPML on my website hidden link, and I'm trying to resolve performance issues that have arisen since the installation.

Symptoms:
The website has become extremely slow and unresponsive after installing WPML. Disabling WPML restores normal performance, but deactivating other plugins or switching to a default theme does not help. See the attached images.

Questions:
How can I resolve the performance issues caused by WPML?
Are there specific settings in WPML that could be affecting site speed?

February 27, 2025 at 8:41 pm #16758102

Andrey
Supporter

Languages: English (English ) Russian (Русский )

Timezone: Europe/Kyiv (GMT+03:00)

While one of my teammates addresses your ticket, I will provide you with some initial debugging steps.

There are several items you can take to enhance performance. This ticket includes a checklist that you can follow to help make your site faster: https://wpml.org/forums/topic/how-can-i-improve-performance-of-a-slow-site/#post-15350474

March 3, 2025 at 11:35 am #16768759

lonnekev

I have done all of the things listed an there's no change in load time or number of database queries. Can you help investigate?

March 3, 2025 at 11:43 am #16768822

Carlos Rojas
Supporter

Languages: English (English ) Spanish (Español )

Timezone: Europe/Madrid (GMT+02:00)

Hello,
My name is Carlos and I will continue working on this ticket

1.- Please share a URL where the performance issue can be seen.

2.- Share the access credentials in your next message that I have set as private. Also confirm you created a full site backup that you can use to restore the site if necessary.

Regards,
Carlos

March 3, 2025 at 1:16 pm #16769212

Carlos Rojas
Supporter

Languages: English (English ) Spanish (Español )

Timezone: Europe/Madrid (GMT+02:00)

Thank you for sharing the credentials requested.

1.- Please share a URL where the performance issue can be seen.

2.- Also, update the outdated functionalities that appear in this link: hidden link and double-check if the issue persists.

March 3, 2025 at 1:30 pm #16769304

lonnekev

It can be seen here for example: hidden link

But the load times are bad both on the frontend and also the CMS itself.

The updates didn't help resolve the issue.

March 3, 2025 at 2:11 pm #16769445

Carlos Rojas
Supporter

Languages: English (English ) Spanish (Español )

Timezone: Europe/Madrid (GMT+02:00)

Hi there,

I was able to reproduce the issue and I have escalated this ticket to our 2nd tier of support where our specialists will take a deeper look.

I will keep you updated on the evolution of this ticket.

March 4, 2025 at 9:26 am #16772597

Carlos Rojas
Supporter

Languages: English (English ) Spanish (Español )

Timezone: Europe/Madrid (GMT+02:00)

Hi,

Do you authorize me to create a copy of the staging site so our 2nd tier specialists can run more tests in a local environment?

March 4, 2025 at 2:37 pm #16774726

lonnekev

Yes, you can go ahead.

March 5, 2025 at 11:33 am #16778169

Carlos Rojas
Supporter

Languages: English (English ) Spanish (Español )

Timezone: Europe/Madrid (GMT+02:00)

Thank you for your authorization.

Before I create a copy of the site, could you update all outdated functionalities that appear in this link: hidden link and then double-check if the performance issue disappeared?

March 6, 2025 at 10:09 am #16782321

lonnekev

I've updated everything. The code profiler plugin is not familiar to me (I assume you've installed it), but I can't update it. The Smush Pro plugin I can't update because the license only works on the main domain and not the staging domain. I've updated it on the live site as well and it doesn't resolve the issue. Updating the other plugins also didn't resolve the issue.

March 6, 2025 at 10:32 am #16782578

Carlos Rojas
Supporter

Languages: English (English ) Spanish (Español )

Timezone: Europe/Madrid (GMT+02:00)

Thank you very much for your message.

I have created a copy of the site and sent it to our 2nd tier specialists for further analysis. I will keep you updated on the evolution of this ticket.

Thank you for your patience and understanding!

March 12, 2025 at 9:46 am #16805993

lonnekev

Do you have an update for us? The site is barely usable now.

March 12, 2025 at 9:57 am #16806086

Carlos Rojas
Supporter

Languages: English (English ) Spanish (Español )

Timezone: Europe/Madrid (GMT+02:00)

Yes, our 2nd tier specialists are already working on this issue and have identified the potential culprit.

I will get back to you as soon as I get more information.

March 18, 2025 at 8:04 am #16828369

Carlos Rojas
Supporter

Languages: English (English ) Spanish (Español )

Timezone: Europe/Madrid (GMT+02:00)

Hi there,

This is an update: our 2nd tier specialists with our compatibility specialists are taking a deeper look at this issue that is coming from the WooCommerce Force Default Variant plugin and the nm_template_loop_attributes function in the theme Savoy.

It would be great if you could contact the Savoy and WooCommerce Force Default Variant plugin support so they can be aware of these issues.

I will get back to you as soon as I get more information.