Not being able to run at full speed probably has something to do with the CPU being run at half speed. But yeah, be careful, now that Satourne is getting better I expect we'll see a lot of bullshit relating to Saturn emulation.
I haven't tried it yet (not looking forward to 1 FPS) but its website states
Finally, after a whole year of developement, here it is: the first public release of SSE! That's it, a brand new SEGA Saturn and Titan-Video (the so called ST-V) emulator, featuring commercial games support.
First of all, believe it or not, this emulator is not yet capable of running ANY Saturn game at full speed, at least on nowadays hardware...
And don't even expect it to be complete, as it's missing many parts of the emulated hardware and the ones currently implemented are still very buggy. It's still a BETA and i'll continue improving it still for a looong time.