Woow. It is interesting. I wrote it earlier that I could not see any changes when I disabled the default GPU flushing settings. And I still didn't noticed anything when I randomly played with these options.
Now, I set everything to "flush and wait (loop)" in v0.17 and it feels like I have a display at 72/96/120Hz or I applied some FRC filter with motion interpolation. (I played with some AviSynth plugins but they never worked well enough.)
I can not see any significant increase in CPU load, core0 isn't peaks at 100% and the overall load is ~25% (with 1080p24 source). GPU load is negligible (it shows 0% with some little peaks around 8% but my GPU clocks are always peaks at 775Mhz now - not a real problem for me, I have passive water cooling...)
Other settings: 3DLUT enabled (with gamut correction only), Spline64 resize (all 3), everything else unchecked.
Software: Windows 7 x64, MPC-HC 1.3.1906.0, FFDShow 3463 (custom icl11 build) without any filters (expect subtitle renderer), madVR 0.17
Hardware: HD5850 with 8.74 beta driver (more than 2 month old, but this is the latest leaked build at this time), Q6600 @ 3600Mhz, DVI attached monitor at 1920x1200@60Hz
I won't care about 72/96/120 Hz support anymore. (At least until I will be brainwashed that I need an LCD shutter glass and 3D - not until we get some PC monitor with IPS panel at 120Hz with a reasonable price. So, not in the "not so far as you think future".
)
It is very funny if I think about the fact that it should have been working like this from the very beginning (but, at least with Vista and EVR...).
If you would remove these settings from the control panel then leave the switches in the settings.ini