Wow
Wow. You weren’t kidding! It’s completely unusable. I want wasn’t even able to tell what the site was before I gave up.
Single cpu speed and SSD speed are big factors. How fast is the CPU? You don’t have spinning metal disks do you? Have you run discourse setup or changed the memory settings since your changed the amount of ram? Have you tweaked the database settings? You are using a Discourse official Standard Installation?
But since your site is mostly serving ads, it’s impossible to tell what the discourse performance is like.