Is the editor of posts, goods, orders for wordpress + woocommerce loading very slowly?

Question

WordPress

The editor of posts, product cards, order details for wordpress + woocommerce is loading terribly slowly. When adding a new article or product - the editor opens only after 15-20 seconds. At the same time, the site (frontend) freezes. The rest of the admin panel (plugins, theme editor, and so on) works smartly. The problem is only with pages (when opening the editor of the page, post, product, order). Other stores on the same theme work fine. Problem only in one store. Who has experienced this? I have already removed the autoload from the database and cleaned the database from old plugins. Did not help.
Regarding posts, it doesn't matter if it's Gutenberg or classic. One and the same
and sometimes gives out altogether
Fatal error: Out of memory (allocated 20971520) (tried to allocate 1413120 bytes) in /home/admin/web/octava-market.com/public_html/wp-includes/functions.php on line 4212

Answer 1

If you have VDS, look at the memory limits (memory_limit) in the php settings, it might be worth increasing. Within reasonable limits.
If virtual hosting, write to the TP, but they will most likely answer you that you need to check and optimize the scripts on the site.
In any case, try Query Monitor, maybe it will point out the problem areas.
For some shared hosters this works:
php.ini
max_execution_time = 80
max_input_time = 80
memory_limit = 182M

Answer 2

Query Monitor helped. The problem was in the Slider Revolution plugin. I created a very large load and many requests to the database. After the shutdown, everything worked like clockwork. Thank you.