As of MAME 0.201, you can run BGFX/Metal shaders along with Artwork bezels without taking a huge performance hit. This is really great news. BGFX/Metal is finally becoming stable on Macs.
Just to remind you why Artwork matters (click to enlarge):
|My iMac running 1943|
|My iMac running 1943 with Artwork|
Here is my testing of MAME 0.200 vs. 0,201 in BGFX/crt-geom-deluxe/Metal with Artwork/without Artwork - from the Terminal in the MAME main directory:
./mame64 -video bgfx -str 60 -noafs -bgfx_screen_chains crt-geom-deluxe -bgfx_backend metal -noreadconfig -nosleep -nothrottle (-nobezel) (romfilename)