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Hello,
I manage a site that uses WPBakery, the Triss theme (with a child theme), Woocommerce.
I've installed Litespeed but it's causing problems, especially in the backend where it slows down a lot.
I'd like to improve performance (maybe change the cache plugin?) knowing that there's a lot of CSS/PHP.
What can I do?
You can try changing the caching plugin. There are several [caching plugins](https://www.wpbeginner.com/plugins/best-wordpress-caching-plugins/).
But I’d also recommend checking this [speed optimization guide](https://www.wpbeginner.com/wordpress-performance-speed/). I follow it for my sites and it helped.