The video card is getting kind of outdated, it just supports opengl 3.1 and it's based off the nvidia gtx 285, Jpcsp will also only use one GPU so it won't take advantage of SLI, Jpcsp uses OpenGL (not Directx 11) so it's important to make sure you have the latest drivers installed, it used to work ok on my older 9800 GTX+ so it should work ok on your card,
I'm not sure exactly what CPU you have but if it's the second or third gen I7 make sure Jpcsp is using the NVIDIA GPU and not the integrated Intel video card.....
As for sonic stage you need to use version 4.3 , you don't need to open it for it to work if you hear sound in video playback its most likely doing what its supposed to. some games use mono (at3+) audio for voices this is still unsupported in the emulator, you can use the sound forge method to get these audio types working, more info can be found here
http://www.emunewz.net/forum/showthread.php?tid=5293
as for FPS issues, I can't really say since I don't have this game, post a Log.txt and profiler.txt information for the game, maybe it will have some new info the devs can use to speed it up.
I'm not sure exactly what CPU you have but if it's the second or third gen I7 make sure Jpcsp is using the NVIDIA GPU and not the integrated Intel video card.....
As for sonic stage you need to use version 4.3 , you don't need to open it for it to work if you hear sound in video playback its most likely doing what its supposed to. some games use mono (at3+) audio for voices this is still unsupported in the emulator, you can use the sound forge method to get these audio types working, more info can be found here
http://www.emunewz.net/forum/showthread.php?tid=5293
as for FPS issues, I can't really say since I don't have this game, post a Log.txt and profiler.txt information for the game, maybe it will have some new info the devs can use to speed it up.
Try Out JPCSP Launcher v1.8.0.4 | How to post a log