the problem I heard is that vp50 adds input lag which is not acceptable to play ssf2x on acompetitive point of view
It adds lag that's true, but something else is going on with your setup because CPS1-2-3 are NOT PCBs that require sync adjustment.It will display just fine as long as the OSSC is configured in a compatible way (I think 2x or 3x will work but not 4x or 5x esp 5x if you don't have a 1080p LCD).
I suspect you are trying to adapt the OSSC's output into something strange.
Just go HDMI to DVI and connect the DVI directly to your Vewlix LCD, connect the RCA output of the CPS2 directly to your Vewlix cab amp.
OSSC is kinda fiddly to get working on Vewlix because the LCD is so picky, but honestly it produces the best image quality.
Better than the xRGB Mini, even better than Taito's own scaler in every category but one... Taito produces an analog image that is 640x480/VGA compliant (so it works with more displays).
If you want to reduce it to a minimum, ditch the Vewlix and get a proper CRT cab I would say
This is a terrible idea, Vewlix is one of the best arcade machines ever made!Pascal dose make a good point believe it or not however... IF lag was the primary concern, Vewlix isn't the best choice here.
I tolerate the lag, don't get me wrong I still work to minimize it whenever possible...
I consider it a drawback to using LCD display tech, but for me personally the other positives of an LCD cab are worth the trade off.
Negative:
Lag
Narrow viewing angle
Improper blacks
Narrow sync range
Improper ratio (I keep mine set to 4:3 so its wasted screen space only)
Positive:
Lighter
Smaller/thinner
Easy/safe to service, no high voltage transformers, nothing to discharge
Easy to get replacements (brand new directly from Taito, brand new homemade or even used LCDs from Craigslist)
Easy to rotate (see lighter/thinner/etc)
Syncs ranges above 31khz (640x480~1920x1080 *on some models)
No convergence to adjust (all dot cloths are perfect)
Accepts both analog D-Sub and digital DVI input
No image retention (aka screen burn-in)