render_list benchmark output

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Total for all tiles rendered
Meta tiles rendered: Rendered 300 tiles in 22.38 seconds (13.40 tiles/s)
Total tiles rendered: Rendered 19200 tiles in 22.38 seconds (857.89 tiles/s)
Total tiles handled: Rendered 300 tiles in 22.38 seconds (13.40 tiles/s)
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Zoom 07: min:  0.5    avg:  0.5     max:  0.5     over a total of      0.5s in 1 requests
Zoom 13: min:  0.4    avg:  0.5     max:  0.7     over a total of      9.2s in 17 requests
Zoom 14: min:  0.4    avg:  0.5     max:  0.7     over a total of      7.9s in 15 requests
Zoom 15: min:  0.4    avg:  0.6     max:  1.8     over a total of     15.8s in 27 requests
Zoom 16: min:  0.3    avg:  0.6     max:  1.9     over a total of     24.3s in 41 requests
Zoom 17: min:  0.4    avg:  0.6     max:  1.8     over a total of     72.1s in 123 requests
Zoom 18: min:  0.4    avg:  0.6     max:  1.9     over a total of     48.1s in 76 requests
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