Rough test of input lag in the PS3 PS1 Classics version of Darkstalkers 3 on my set-up, which includes a Hori HRAP V 2017 arcade stick, a 4x2 component matrix switcher, an OSSC, a 5ms display lag monitor, and a slim PS3. On a computer, if you're playing this video at 60 fps, you can pause playback, then advance one frame at a time by pressing the "." key, and count along with me the frames that go by between the arcade stick's light punch button being fully pressed down, and Morrigan beginning to play her light punch animation--just make sure the video playback quality is at a 60 fps setting in your YouTube player.
I counted 5 frames of delay for Morrigan's light punch, in VS mode.
That's two frames more than the 3 frame delay I measured by the same method for Darkstalkers 3 running on a PS2: https://youtu.be/u51LZAfhXqE . So that's a bit more delay than I thought for PS1 Classics, dang.
I recorded the video on my Google Pixel 3a phone, with its Camera app set to 60 fps recording.
Note to self: reprocess this in Any Video Converter; results in a larger file but YouTube will show that version at 1080p60, whereas it only shows the camera's original version at up to 480p60.
smbhax 2000 currently has 3,996 views spread across 34 videos for Darkstalkers 3. This game accounts for over 1 day of watchable video on his channel, less than 0.79% of Darkstalkers 3 video content that smbhax 2000 has uploaded to YouTube.