Background of the issue:
My site, hidden link, has a multicurrency feature. I previously used Curcy multicurrency and now plan to use WPML's multicurrency plugin. My site uses Redis Object Cache plugin for object cache and LiteSpeed Cache for other cache. All product pages and the home page display prices. Cache is important for site performance. I just started configuring WPML and haven't started translation yet. I read this article: https://wpml.org/forums/topic/object-cache-pro-causing-wpml-issues/page/2/#post-14302565. I use Redis Object Cache free version.
Symptoms:
There is a notice in the dashboard about caching: Caching may cause currency display issues for your customers if you are using the multicurrency feature.
Questions:
How to configure the cache to avoid display issues with WPML's multicurrency feature?
Does the Redis Object Cache free version work for my case?
I didn't come across any actual display issue yet. It's only about the notice in wordpress dashboard, so I wanna ask. I am still getting familiar with WPML:
WooCommerce Multilingual & Multicurrency detected an active cache plugin on your site.
Caching may cause currency display issues for your customers if you are using the multicurrency feature.
To avoid this, set your cache plugin to not cache pages for visitors that have a cookie set in their browser.
Redis Object Cache is different from typical page-caching plugins (like WP Rocket, LiteSpeed Cache, W3TC, etc.).
What it does: Redis Object Cache stores WordPress objects/queries in memory, not full HTML pages.
What it doesn’t do: It does not serve cached HTML to visitors, so it cannot be configured to “exclude by cookie” in the way WPML/WooCommerce Multicurrency is warning about.
That warning is generic and is triggered by any caching plugin detected. In your case, it doesn’t actually apply because Redis Object Cache does not affect per-visitor content such as currency switching.
There is no option in the Redis Object Cache plugin’s settings to exclude caching based on cookies, because it only handles object caching, not page caching.
If you are also using a full-page caching system (e.g., at the hosting level with NGINX/Varnish, or another plugin), that is where you’d need to configure cookie-based exclusions (for example, woocommerce_multicurrency_forced_currency cookie).
In our forum, we try to keep one issue per ticket. Therefore, I've split this ticket and created new tickets with your other questions. Please see the new tickets here.
I am still converting site into multilanguage. I will add one more language for now. I've turned off litespeed cache and redis object cache during the course.
What's your suggestion about caching?
My site is unmanaged VPS managed with DirectAdmin. It's a litespeed server.
I recommend deactivating any caching plugin or method during site development and when adding new translations with WPML. After completing the development of your site, I recommend working with one of the caching plugins that are officially compatible with WPML. You can see the complete list here: https://wpml.org/plugin-functionality/caching/.
