You will not be the first person to do this. I still really like how Ruby Jekyll (from which Hyde is the Python port) is a little ahead in this respect, but I also came from the Python / Django background and can understand the desire for some uniformity.
Most of the examples I can think of are done with people using Jekyll, but this blog post says about one person moving from WordPress to Hyde, that they seem to be very happy , as well as this Hyde blog , both of which are potentially have helpful tips for you. Disqus seems to be the preferred commenting platform, and you integrate it simply by embedding JavaScript in your site , so this is a great solution for a static site.
Actually, I do not see "performance" as a serious problem; I may be doing you an injustice here, but it usually seems that those who have enough blog traffic causing performance problems are in a state where they have the money to put a caching layer / additional servers on it. For me, the advantage lies in the flexibility of hosting (almost any of them will host static HTML for you very little) and "security" (the only thing that will be on the server side is the web server).
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