<p></p>
<p dir="auto">I wonder if this is related to <a href="https://github.com/openstreetmap/mod_tile/blob/24a5752d93bb04477bfd96255f0d4f0fbb9e4867/src/render_submit_queue.c#L207-L213">https://github.com/openstreetmap/mod_tile/blob/24a5752d93bb04477bfd96255f0d4f0fbb9e4867/src/render_submit_queue.c#L207-L213</a></p>
<p dir="auto">This limits the queue size to 32, which might be too low modern hardware. But as far as I can tell, this file is only included by the render_* helper programs.</p>
<p dir="auto">There are also a bunch of constants for mod_tile that might not make sense on modern hardware: <a href="https://github.com/openstreetmap/mod_tile/blob/24a5752d93bb04477bfd96255f0d4f0fbb9e4867/includes/mod_tile.h#L24-L33">https://github.com/openstreetmap/mod_tile/blob/24a5752d93bb04477bfd96255f0d4f0fbb9e4867/includes/mod_tile.h#L24-L33</a>, or the queue size constants <a href="https://github.com/openstreetmap/mod_tile/blob/24a5752d93bb04477bfd96255f0d4f0fbb9e4867/includes/render_config.h#L112-L114">https://github.com/openstreetmap/mod_tile/blob/24a5752d93bb04477bfd96255f0d4f0fbb9e4867/includes/render_config.h#L112-L114</a></p>

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