WPML admin panel is very slow with multiple languages in WooCommerce

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

Problem:
You are experiencing a significant slowdown in the WordPress admin panel when managing products in multiple languages using WPML on your WooCommerce site. The site has 23 languages and approximately 4600 products. The slowdown is directly linked to the activation of WPML Multilingual CMS, and deactivating it restores the admin panel speed.
Solution:
We recommend creating a staging site to safely test without affecting your live environment. You can use the WP Staging plugin for this purpose. Once the staging site is set up, please share the access credentials with us in a private message so we can further investigate the issue and identify specific optimizations or solutions.

Please note that the solution provided might be outdated or not applicable to your specific case. We highly recommend checking the related known issues, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If the issue persists, please open a new support ticket.

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Tagged: Performance

This topic contains 10 replies, has 1 voice.

Last updated by Carlos Rojas 9 months, 3 weeks ago.

Assisted by: Carlos Rojas.

Author	Posts
September 20, 2025 at 10:28 am #17418097
faridi-3	Background of the issue: I am trying to manage my products and content in the admin panel of my WooCommerce site, hidden link, using WPML for multiple languages. Symptoms: The WPML admin panel is extremely slow when multiple languages are active. Questions: Hello WPML Support Team, I am experiencing a significant slowdown in my WordPress admin panel, particularly when managing products in multiple languages (23 languages). Recently, I have not added new products, yet the admin performance has worsened. Here are the details of my setup and actions I have taken: WordPress Version: Latest PHP Version: 8.2 Theme: Woodmart Plugins: WPML, WP Rocket, UpdraftPlus, and a few others WP Rocket Optimizations Done: Database Cleanup: Post revisions, transients cleared CSS/JS: Minified PHP Settings: WP_MEMORY_LIMIT: 512M WP_MAX_MEMORY_LIMIT: 512M set_time_limit: 300 Multilingual Setup: Admin panel shows only Estonian, other languages are hidden for testing Other Notes: No unnecessary plugins are active besides UpdraftPlus; lazy load is already handled by the theme Issue: Despite these optimizations, the admin panel is still very slow when accessing products. I want to improve the speed without losing any product data or multilingual content. Could you please advise: If there are WPML-specific optimizations I can apply for better admin performance? Whether hiding languages or performing database cleanup affects WPML data integrity? Any other recommended steps for large multilingual WooCommerce stores?
September 21, 2025 at 9:15 am #17418812
faridi-3	Hello WPML Support Team, I have confirmed through testing that the admin panel slowdown is directly caused by WPML Multilingual CMS. When I deactivate WPML Multilingual CMS, the admin panel speed returns to normal. Activating it again immediately triggers the slowdown. My site has 23 languages and ~4600 products, which previously worked fine. Could you advise on any WPML-specific optimizations or solutions for large WooCommerce stores to restore normal admin performance without deactivating WPML? Thank you for your help. Best regards,
September 21, 2025 at 9:16 am #17418813
faridi-3	My site has 23 languages, with a total of 4600 products, so approximately 200 products per language, which previously worked fine.
September 21, 2025 at 10:52 am #17418899
faridi-3	For clarity, Redis is active on my hosting, and when WPML is deactivated, the admin panel is fast even with all ~4600 products visible. This confirms that the slowdown is entirely WPML-related, not server or product-count related.
September 21, 2025 at 10:53 am #17418900
faridi-3	Urgent
September 21, 2025 at 12:14 pm #17418931
faridi-3	I am experiencing a severe slowdown in my WordPress admin panel caused directly by WPML Multilingual CMS. Details: Site: hidden link Languages: 23 Products: ~4600 (approx. 200 per language) WordPress Version: Latest PHP Version: 8.2 Theme: Woodmart Other Plugins: WP Rocket, UpdraftPlus, and a few others Redis is active on hosting Observations: When WPML Multilingual CMS is deactivated, the admin panel is fast, even with all products visible. Activating WPML immediately triggers the slowdown. No new products or pages have been added recently; this issue appeared suddenly. When trying to add a product to the cart from the product page in the front-end, the action keeps loading and does not complete. Despite this, the site is still functional for customers—they can browse the site, but product pages and add-to-cart functionality are affected in the admin/front-end. Request: Please advise WPML-specific optimizations or solutions for large WooCommerce stores to restore normal admin performance without deactivating WPML, and to fix the add-to-cart issue. This issue is urgent as the admin panel is nearly unusable, and product functionality is affected, though customers can still browse the site.
September 21, 2025 at 12:20 pm #17418935
faridi-3	I have confirmed that the admin panel slowdown and product page issues are directly caused by WPML CMS. Issues observed when WPML CMS is active: Product detail pages: "Add to Cart" button does not work. Users cannot add products from the product page. Checkout page: Maksekeskus payment method (post machine selection) is frozen and cannot be selected. Admin panel: Extremely slow when accessing products, even with all ~4600 products visible across 23 languages. Important: WPML deactivated → all issues disappear. Redis is active → confirms issue is WPML-related, not server or Redis. Customers can still browse the site, but admin management and product interactions are severely affected. Request: Please advise urgent WPML-specific solutions to restore normal admin and product page functionality without deactivating WPML.
September 21, 2025 at 3:18 pm #17419216
faridi-3	PHP Version: 8.3,24
September 21, 2025 at 3:45 pm #17419243
faridi-3	Sorry PHP Version: 8.2 NO my website PHP Version: 8.3,24
September 21, 2025 at 3:51 pm #17419303
faridi-3	Since activating WPML on my website, I started encountering a 500 Internal Server Error. When WPML is deactivated, the site works normally.
September 22, 2025 at 8:40 am #17420420
Carlos Rojas WPML Supporter since 03/2017 Languages: English (English ) Spanish (Español ) Timezone: Europe/Madrid (GMT+02:00)	Hello, Thank you for contacting us Please create a staging site (you can use the WP Staging plugin for free) and share the access credentials in your next message, which I have set private. This will allow us to run tests to isolate the cause of the issue without affecting the production site. Looking forward to your message. Regards, Carlos