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Disqus loads absurd amount of tracking services, which exposes your visitors’ personal data and significantly increases loading time. See, e.g., this post.
For a static website, one usually wants a lightweight commenting server with as little dependencies as possible. Few commenting engines listed on the page are provided by heavy frameworks and web-applications (e.g., django-fluent-comments, discourse, talkyard), but the majority are relatively lightweight applications designed specifically to provide comments for the static pages.