I wasn't quite sure where to report it so here it goes.
I'm experiencing slowdowns while playing R-Type Delta NTSC-U with egbla's bladesoft as graphic plugin and shalma's Dsound plugin. I have a decent machine so I don't think it's an hardware limitation.
In epsxe it works fine with the same plugin configuration.
GeForce GTX 550 Ti
Windows 7 64bit