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If you're doing a database lookup for every page load for comments, you're doing something wrong. Also, you'll be moderating comments, unless you want your blog to become a cesspool of hatred or spam, so the page becomes even less dynamic. Myself, I'd put the comments on a separate resource so that the static page would never be affected by that load, whether POSTing or GETing, and load async. (so your static site is always up, even if your comment system falls over)

You are not doing something wrong, you are simply not designing for high-load. Loading things dynamically on every request is perfectly fine for almost any blog.

Moderation is offtopic. Putting comments on a different system seems like overzealous, premature optimisation...

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