I have magento 2.4.1 in azure and i have around 400 products but i don`t know why page_cache takes a lot of memory sometimes up to 13GB
var/page_cache is used by Full-page Cache and caches all the content of your pages. This could be excessive if your pages are too big, content-related. This issue could also be coming from third-party plugins, are you using any that could be increasing your page size uncontrollably?
Francisco de Paz