New tests. This time I have find the first (iirc) glitch-free games with low performance, one is pretty surprising.
The Story of Thor 2 (US). Playable. Works fine, no issues so far. None to minor input lag.
The Lost World: Jurassic Park (US). Problematic. The runs fine until level three, there it has really low performance, not present in the real hardware. It could be related to one reflection effect done at the beginning of the level (1). But it could be other issue. I haven't tried more levels. If that's the only slow level, well, it wouldn't be a big deal.
Lupin Sansei: Pyramod no Kenja (JP). Playable. Works fine, no issues so far. I would recommend to remap camera. Default mapping is a mess.
Machine Head (US). Playable. Performance is sometimes a bit over the place, but I think it just worked like that on the real hardware. The real problem is the input lag, pretty high here. All Crystal Dynamics games are a bit problematic on Saturn.
Manx TT Superbike (US). Playable. Works fine, but it has graphics corruption on the left side of the screen, not a big deal, but it is a bit distracting (2). Minor input lag.
Marvel Super Heroes (US). Playable. Works fine, no issues so far. None to minor input lag.
Mass Destruction (US). Playable. Works fine, no issues so far. None to minor input lag.
Mega Man 8 (US). Playable. Works fine, no issues so far. None to minor input lag.
Metal Slug: Super Vehicle 001 (US). Playable. Works fine, minor buffer issues when the game lists the rescued prisoners (3). None to minor input lag.
Mobile Suit Gundam Side Story I: Senritsu no Blue (JP). Playable. Works fine, no issues so far. None to minor input lag.
NASCAR 98 (US). Works fine, no issues so far. None to minor input lag.
NBA Live 98 (US). Unplayable. Crashes before the match. I guess it uses the same engine as FIFA: Road to World Cup 98.
Night Warriors: Darkstalker's Revenge (US). Works fine, no issues so far. None to minor input lag.
Off-World Interceptor Extreme (US). Videos stutter a lot, so hold on in the initial black screen, it takes a while to see the first video. Other than the extremely slow videos, it works perfectly fine. None to minor input lag.
Pandemonium! (US). Unplayable. And this is the surprise. Pandemonium! is the slowest game I've seen so far, while graphics are perfectly fine. It's surprising since it is one of the simplest games Saturn and Playstation had. London studio Ideaworks3D even ported the Playstation code to N-Gage, rewriting the renderer into software, and it worked really good. But, again, it's a Crystal Dynamics game, so who knows how they developed for Saturn.
(1)
(2)
(3)
My apologies to
@xYuunax. I couldn't test the optimized config, I have been a bit busy (this was tested earlier today). I hope I can do some more tests tomorrow night.