[Tile-serving] [openstreetmap/mod_tile] Time spent per tile changes to 4.2 seconds when there is a queue (Issue #333)

[Paul Norman]

I wonder if this is related to https://github.com/openstreetmap/mod_tile/blob/24a5752d93bb04477bfd96255f0d4f0fbb9e4867/src/render_submit_queue.c#L207-L213

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.

There are also a bunch of constants for mod_tile that might not make sense on modern hardware: https://github.com/openstreetmap/mod_tile/blob/24a5752d93bb04477bfd96255f0d4f0fbb9e4867/includes/mod_tile.h#L24-L33, or the queue size constants https://github.com/openstreetmap/mod_tile/blob/24a5752d93bb04477bfd96255f0d4f0fbb9e4867/includes/render_config.h#L112-L114

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