You can then push the content to something Amazon's s3 and put cloudfront in front to speed things up.
You'll have to then offload the comments to a service but that is relatively easy and cheap. A service like discus is only $9 a month. Moving to s3 you'll save that in hosting. (I run two sites like this and pay $0.07 on average per month). Not to mention those services are pretty good at filtering spam.
There are some other options around too. https://darekkay.com/blog/static-site-comments/
Wordpress is nice but it will never out perform static content.
EDIT: I just read this in discus "Free For small, personal, non-commercial sites who do not run any ads. This plan includes everything in Plus except Direct Email Support."