@PaBLoNeKeN FBA Libretro 0.2.97.40 works fine under Recalbox 4.0.2.
Psikyo / Jaleco games are still running fullspeed thanks to @barbudreadmon SH2 fix and i haven't noticed any particular problems with the other games i'm using. Colour bugs and slowdowns that plagued Irem Games (R-type, R-type 2, R-Type Leo) in previous releases are gone and those titles are really playable now using FBA as they have always been with Mame 2003. All Sega system 16/18 games (Outrun, Shinobi, Altered Beast, Moonwalker...) got proper drivers rebuilt and work better than with Mame.
Metro Games (dharma dojo, gunmaster, pururun...) are now supported but to run them full speed an overclocked Pi3 with a minimum of 1350 Mhz is required (1400 Mhz prefered). Any clock frequency Under 1350 Mhz will bring up sound glitches and slowdowns.
That's a very nice addition to FBA as far as, until now, only Mame 2010 had been able to run those games with a poor performance though even when using a high overclock frequency (75% game speed only @ 1500).
According to some posts i have read on various forums, it seems people are reporting colour problems with some of the Konami Games. But so far, all the ones i've tried with FBA worked fine (Turtles, Turtles in time) so i don't really know if the issue is real or not.
All in all i cannot complain about this new release of FBA performance-Wise at least on Pi3. I'll try to run further tests using my old Pi2 in the coming weeks and see if there are significant improvements too with this core on older platforms.