The way you're computing decoder's efficiency for each tools is flawed : you have to measure the loss of time, not the loss of fps. Because losing 1sec on a 5 sec decoding time at 100 fps means a drop of 16.66 fps, while losing 1 sec on a 5 sec decoding time at 50 fps means a drop of 8.33 fps.
Enabling a feature almost always add a constant time, not a proportionnal fps loss.
Also, do consider that incertitude on fps figures you're giving are at least 2 fps.
Finally, what was the average quantizer of the clip you used ( out of curiosity, i think it might explain why ateme's decoder goes faster when deblocking -5 is enabled... )
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