<blockquote>
<p>I wouldn't be too concerned about lack of maintenance though - renderd/mod_tile are intensively used in OpenStreetMap's production setup so if it works for them</p>
</blockquote>
<p>Well, it sort of works. However, given how frequently people complain about slow tile rendering or gray tiles, and we already know that there are issues with inefficient queue manegement (<a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="199441223" data-permission-text="Issue title is private" data-url="https://github.com/openstreetmap/mod_tile/issues/152" href="https://github.com/openstreetmap/mod_tile/pull/152">#152</a>), I think it's obvious that this area would benefit quite a lot from some rework. Today, most of the CPU resources for rendering are more or less idle during the night, as an example.</p>

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