First of, a couple of things out of the way:
Yes, I have got Vsync Patch and yes I made it fully work with Japanese Applocale.
I have no input delay whatsoever...
However, while there is no delay with that, there is screen stuttering. Particularly on Remilia?s fight (ESPECIALLY on Mountain of a Thousand Needles, as well as Scarlet Meister, but really its almost everywhere in her fight) but its present on a lot of other places as well, and quite noticeable. The FPS itself is not the problem, it stays at a fixed 60 all the time (At least, that's what the game says, anyway... I can definitively feel it stutter though). Obviously this really worsens the experience a lot, plus its kinda hard to play like this. Might not be actual input delay, but it still gets in the way of gameplay.
I already tried out a fair amount of options. What I discovered; This seems to happen ONLY with the Vsync Patch. If I use the original game.exe, theres NO screen stuttering at all (However, then I would have to deal with Input Lag... so obviously not a solution either).
It also works fine with Vsync Patch on Windowed mode... but I rather play in Full Screen.
I tried to play on super low graphics and it seems irrelevant, the only way to get it all to work correctly with Vsync is on Windowed for SOME reason.
If it helps, I found an old thread with somebody who seemed to have a similar issue as me, but sadly nothing really came out of it:
https://www.shrinemaiden.org/forum/index.php?topic=12822.0...Not quite the same (I don't have 45 FPS drops, its more like simple Stuttering all over the place, the FPS counter just says 60...) but it seems somewhat similar.
Soo... anyone has any clue what could it be? Thanks for your answers. None of the other Touhous have issues like this, or if they do, its extremely minuscule and can be ignored (EX I get a bit of stuttering when the Prismrivers declare their first Spellcard on PCB for whatever reason, but that's just ONE time as opposed to being present on most of the game like it does in EoSD).